Hi Wanderlust. I'm sorry you're not feeling well and that you've been having migraines. I completely understand how that is, since I've shared such experiences.
I certainly can't definitively know if you are experiencing depersonalization or derealization, or what's going on, but it will eventually resolve itself. Have you tried using some grounding techniques?
In the past, I have written about my experiences with depersonalization/derealization, migraines (incl. silent types), and even likely Simple Partial seizures. It confused me a lot which was happening when. I even wonder how much anxiety issues played a part in some of it. I'll say that for some years I have not been affected by any of these, or at least minimally so.
As I wrote above, I have written a number of blog posts about my experiences with mental/neurological issues. One post that ties it all together is at
Psychiatric Avalanche Effect – Unraveling the mystery of my past brain quirks – Bird Flight