I'm not a doctor, I can only go by what you're posting but this is what I'd do.
- paper diary or diet tracking app
- roster of foods safe for you to eat
- assemble target list of specific doctors and tests. i.e., no shotgun approach.
The combination of swelling and rash could be the type of allergy we deal with on this board, the life threatening type IgE-mediated. First step is to get either an EpiPen or Auvi-Q, both are epinephrine auto-injectors for life threatening allergic reactions. You'll want them on hand and know how to use them and when. They are time buyers for emergency services to reach you and since you have a young child dependent on you not to be incapacitated you don't want to be a hero here. Your primary care provider can prescribe one hopefully a nurse or pharmacist can go over injection, failing that look on the websites for injection instruction.
Then get MedicAlert bracelet if for no other reason if you crash can't speak for yourself it will state you experience severe allergic reactions. You can worry about the whats and how severe later but in the meantime you have the young child in care to think about.
Next let's talk about getting you to normal. Test results are notoriously high in false-positives but for now let's assume you are allergic to all that you said it doesn't really matter because you'll need an elimination diet anyhow.
Identify a list of whole, nutritious superfoods that will get provide you with a base diet. How about brown rice, bananas, broccoli, oranges, carrots, sweet potatoes, fish(?), dark leafy greens, tofu(?), soy or rice milk or coconut milk, a good vitamin, maybe some quinoa, oats, possibly think about baking your own very plain bread, find a margarine that works for you and some cooking oil as well. Whatever you can eat and like to eat this is just a suggestion.
Then go to AAAAI.org. Use their allergist search to find one in your area board certified who understands food allergy well.
Start a base diet avoiding all that you even think you're allergic to. Then you can start trying some of the meats, personally I'd start with pork it would be an extremely rare allergen. Keep notes in either a diary or a diet tracking app. The key items to track is what you ate, what symptoms and WHEN they occur. True food allergies operate within a fairly expected time frame and set of symptoms. A good food allergist can sort out that info with you and
test smartly.
For nuts, eggs and milk, you may want to do something called an
in office food challege IOFC. It takes the guess work out by having a clinician observe any reactions you have.
The last piece of advice I have is be prepared if this is
not food allergy but something else. Autoimmune issues occupy many fields of medicine and for the sake of argument say you have some sort of autoimmune condition, it may have nothing to do with food allergies and may require someone in the correct discipline to diagnose and treat you. The idea that you throw up or have diarrhea from nearly anything puts a huge mark in the non-IgE mediated category but there are certainly other conditions that would cause that.