Frequent allergies. Totally avoid them?

I found I was allergic to sulfur when I went to a hot spring and had some water thrown on me. I got a really bad full body rash which lasted almost a month. Since then, every year I have gotten a bad rash, once apparently due to eating too much carrot halwa, once when I had to wear a blazer directly on top of a saree in my farewell, rashes from hair removal creams, now I had to take amoxicillin for boils and ended up getting a full body rash with it too. I am having treatment for it but I'm getting tired of all these rashes occurring year after year. Is there a way to find out exactly what things I am allergic to so I can totally avoid them? I'm afraid of skin prick tests because in my case, the allergy can flare up and spread to the whole body within a day. Please help me out.