The grade doesn't tell you much. People can be grade 5 and not actually allergic and can test very low and be highly allergic. Test results need to be used in conjunction with past reactions to make a diagnosis. So, the fact that you tested positive to these foods doesn't mean that you are allergic to all of them. If there are some on this list that you have been eating with no reaction then they are false positives. Studies have found positive test results are wrong quite a lot of the time. In some studies 86% of the time positive results were wrong! It would be good to figure out what caused the reaction you described. Do you have epi pens and a written emergency plan? I would feel anxious if I didn't know what caused that reaction, too! But once you know what to avoid and have epi pens and a written emergency plan of when to use them you should feel more relaxed.
It sounds like you have been eating wheat all the time so I would assume that one is a false positive. I would guess that your bread (toast) has soy or egg or both in it. Does Yorkshire pudding have egg in it? If so that sounds like a false positive, too. And false positives are a GOOD thing for you--less to avoid. Even avoiding one food is difficult and a pain. You don't want to have to avoid more than that.
I recommend you put your anxiety level and getting it under control as a top priority as others suggested. Of course you felt anxious. That makes sense. But now you are taking active steps to deal with things and I hope this will help you and your anxiety.
Also, you don't sound like you are eating a very healthy diet at this point. You might want to see a registered dietitian to go over what you can eat safely in order to make sure you are getting enough protein (that seems pretty absent from what you are eating), fat, etc.
I would not ask for *more* testing. It is possible to develop an allergy at any age. the chance of suddenly developing tons of allergies is statistically close to zero, though. Testing is only supposed to be used on foods that one has reason to suspect are allergens. If you go on a fishing expedition chances are you are going to get a bunch of false positives and end up avoiding a lot of foods needlessly. Apples and bananas are very rare allergens. Is there are reason you asked about testing them?