You have to, no, must ask!
These things [anathesias] can really do a number on folks who are sensitive. Do you remember any interview prior to surgery w/an anathesiologist?
They would have asked you lots of pesky questions about the meds you are on, and the vitamins or supplements.

SINCE all you are experiencing is POST SURGERY? I'd ask your surgeon some hard questions about these side effects and ask for a copy of his surgical report. Yes it's gonna be filled w/a lot of medical 'speak'? But even the simplist mind can pick up on possible 'trouble spots' they mite have encountered.

I have to say tho, that normally? SE's from anathesia usually work out of your system within five or so days...UNLESS you've NOT been walking and hydrating, etc. enough. IF you've not moved enough, this could be aggravating some other pre-existing issue.

Worst thing to do? IS PANIC! So...DON'T!
Try and learn about everything. Beat that potential fear with knowledge!
The fear of the 'what if's and if only's' is what gets to us all. Learning and knowing more about what might be going on is a far better way to defeat fear AND make you able to speak to your doctor about your problems.
None of us here are 'brain surgeons', far from it. But we too have been around a few different blocks of medical issues and all have a lot to share if you ask. 's - j