I know its easier to say then do, but I have found for me that keeping a log book over the last 15 years has been a big help. (boy I have a tone of old notes lol) I get up in the morning and if something is bugging me or have a physical symptom/s I will write it down. Same thing through out the day, it might sound OCD but in my case.
I had to go so far as everything I had eaten, drank, vitamins, bp, spo2 etc. Trying to decipher what was migraine vs anxiety related. After 6 months it kinda became a habit to do it. What I found is when I have a really bad day and want to go hit the web MD checker ill grab one of my old journals and back read to see if I had it before. Not saying it stops the anxiety flair up but it does help getting the mind straight on oh ive had this before and im still alive. Another thing is, it is helpful if you go to the doctors or hospital (because in a state of panic its easier to hand them the book and not try to explain.) plus they know exactly what meds you took and when, foods you've eaten, and symptoms.
I'll even add notes on the rarity I do go to the doctor on what they said , tests they run etc.
Has my doing this stopped the anxiety attacks NO, but it did help me to see what foods or environmental variables set the anx or migraines off. By keeping away from those it did make things more bearable.