Kathy - there are many things going on and the main cause is your allergy to the sulpha drug.
If you truly want to get well, you cannot go it alone; doing this or that on your own, will no doubt add to your frustration of not being well. My suggestion is a good talk with a doctor that is familiar with toxic exposure. Adding another drug into the mix only makes things more complicated and harder to solve the problem. Adding drugs to treat your symptoms can make matters worse, cause more reactions and more side effects for you to deal with. Your problems will become so layered you will have a hard time figuring it out.
Conventional doctors do not accept illnesses created by drug allergies or drug reaction [side effects] Your allergy to the drug was merely a serious side effect, a reaction that was severe enough to debilitate you. Their solution - give you drug to counteract the reaction, but they just make it worse. Most doctors when you tell them the problem are not apt to tell you it was all someone other doctor's fault giving it to you in the first place; they tend to stick together.