I had a situation following heart surgery where I kept passing out. One thing led to another and I moved from my apartment into a house and somehow misplaced my bag of drugs.
For two weeks, I was fine, didn't pass out once despite packing boxes, moving, unpacking, etc.
When I finally found the bag, I was like "I bet this is one of the meds..." So I decided to start re-taking them one at a time.
First one I picked was Carvedilol and I passed out 15 minutes later.
Now, I'm not advising you do what I did, stopping any medication can be incredibly dangerous, but maybe make a spreadsheet of everything you're taking, why you're taking it, and any notable side effects are in order.
You might also talk to your pharmacist and explain what's going on, they might have a handle on how drug 'x' interacts with drugs 'y' and 'z' and so on.