The fever has came back on pretty strong in the past couple of hours, I had some subtle signs yesterday that made me think it might do. 
Perhaps more interesting though is I got up late yesterday ( 5pm ) and went to bed early ( 3am ), then I had trouble sleeping, strange dreams,  got up quite early ( 9am ),  this seems to match my previous observations about there being phases where I don't sleep as long. 

Its been about 6 days now since I ate all that unhealthy food that I described and the subsequent symptom relapse.  3 days since the last major energy overexertion.   In other words I am able to predict when the fever will occur,  so its not random 

This makes me think about something that people commonly say about chronic fatigue syndrome. Perhaps if we go with the virus theory, 
by forced resting it allows some increased capacity for an elevated immune response even without the assistance of these organic compounds we are taking ? new article about long covid in guardian newspaper

wow thats amazing, a lot of people with chronic fatigue syndrome have various stomach related problems,  I had acute lactose intolerance / gastroparesis once when I was really ill,  then I was fine for years,  after a change in life circumstances last year I started having some strange new symptoms, terrible sore throats and nausea,  then in the winter I had started having really odd behaviour of the stomach,  
at times when I felt like I had almost no energy or I was trying to use more than I had ( on the verge of what we call a 'crash' ),  my stomach would start feeling different and I would need to go to the toilet suddenly / many times, or I would just produce ridiculous amounts of methane somehow, which would continue into the next day.  I haven't experienced this symptom while on the protocol even though I was quite ill before starting the protocol.  I had a little bit of it last night but thats because a few days ago I intentionally deviated from the diet to test Joshuas hypothesis. 

I was having inconsistent results with the protocol, many experiences lined up with what was expected or predicted to happen, 
I got the weird headache to begin with, it became a problem at times that reminded me to take the sodium benzoate, I got the strong fever within the first few days,  experienced changes in symptom profile and energy levels.   But it seemed to not last or intensify and I had patterns of ups and downs, a light fever feeling that came maybe once a week then disappeared within 2 days seemingly regardless of if I increased the level of oat bran that I was consuming, say from 1 gram to 2 grams.  

This lead me to test different variables, the first was the quality and contents of the supplements,  at first reishi and green tea, I noticed pains in my right side after switching to Life Extension mega green tea extract,  made into empty capsules ( this allowed EGCG from an unknown, probably low amount, up to 30mg or higher ).  I settled with Life Extension brand reishi capsules after various discussions and looked at other products.  

One of the things I tried recently was going on a very restrictive diet, of the same sorts of food as I was already on,  getting calories below 1500 or maybe 1000 per day, I had a suspicion that this would re-induce the fever and it basically did,  but another factor that I decided may have been important, and the only factor that I hadn't considered at length yet was beta glucans.  Most likely its effects stack up over time,  so just trying to take 2 instead of one, as a once off, might not be a good indicator of any scaling effects.  I decided to switch the brand of Lions Mane I was using, because I remembered that it said on the bottle ' 450mg per 3 capsules ',  I am now switched to Time ultra lions mane which have 50% beta glucans content. I noticed that fever was induced shortly after switching to these, but still not an intense one.  During or following the fever I usually have higher energy levels and feel better aside from certain odd feelings that I recognize as something different to standard ME symptoms. 

The other factor I have been observing is diet, when it gets lax and I start to eat more carbohydrates or sugar e.g. one small pizza ( 150g ) I notice that a day or 2 later I feel more rough / less energy, and this seems to disrupt the fever process. Exercise beyond a threshold might also have this interrupting effect ( harder to confirm that ). 

48 hours ago I was feeling ok and was quite active in various ways, I decided to test the diet hypothesis, I ate a bread roll, 2 Cadbury Darkmilk chocolate bars ( around 85g each at around 48% sugar content ), then half of a 450g pizza.  Almost immediately my cognitive function seemed to be 'jammed' and I later got a headache ( though the headache part could have been due to the high temperatures we've been having, so not a fair test exactly there ).  I generally felt all sorts of PEM symptoms heavily come on, which I am still experiencing 48 hours later, and I feel exhausted in general,  yesterday I slept halfway through the day for example.