Watching him be sad about food and coffee and cut grass is awful
You can megadose Vitmain C or find a service offering EDTA chelation therapy (or Vit C IV). This restores the condition of the blood, the body removing the peptide-producing organisms on its own. If they have taken hold in the gut, other modalities will likely be necessary. You may also experience temporary relief by using nicotine patches (this occupies nicotinic acetylcholine receptors targeted by the peptides).
If think the idea of being _envenomated in vivo_ is absurd, I DARE you get a simple toxicological test done on your blood, testing for venom.