My problem is it's hard for me to pick apart my reactions with certainty, as I have more than just allergies. I also apparently have a mast cell disorder, as well as eosinophilic esophagitis. Both the MCAS and the EoE can cause reactions that you can't test for. (Non IgE mediated). MCAS can also cause reactions to things like sunlight, exercise, heat, emotional stress, etc. Also, MCAS, EoE, and food allergies all interact with each other. There isn't an obvious difference between an MCAS reaction and a food reaction, so it becomes much *much* harder to be 100% certain as to why I'm having severe GI distress, hives, a feeling of impending doom, difficulty swallowing, etc. So I get stuck taking way too many pills, avoiding way too many foods, and much guessing as to what causes what.
I feel for you. I am still trying to figure out my own, somewhat similar issues. Same symptoms you are describing, reactions to foods, exercise, heat/cold, and maybe emotions (I haven't paid enough attention to be sure but I think it has happened -- If I get really upset and panicky I tend to flush and get hives on my face, but I'm not sure if that is a normal physiological response to anxiety or not).
I have not been diagnosed with MCAS of EoE though. And all IgE allergy testing keeps coming back negative. My allergist called me this morning to talk about food challenges, and she touched on the fact that some reactions don't seem to be IgE mediated but nobody knows what does trigger them, because the reactions are to all appearances anaphylactic. And epinephrine helps. I
was diagnosed with cold urticaria as a teen, a non-IgE mediated anaphylactoid reaction to sudden drop in body temperatures. It seems to have become much less severe over the last 18 years though, now the worst I get is a few hives and my ears or hands sometimes swell a little. I have reacted significantly to intense exercise. Sometimes the severe GI distress seems to be obviously tied to a food and other times it seems to be random so I don't know if it is a reaction from residual contamination from a known allergy, a new food reaction, or anxiety, or what

Just wanted to say I hear you and I totally understand

I do avoid peanut oil, though, because why risk it?