I'm not a doctor, but I have family who are medical professionals. Since I am not... I'll say, go seek advice of an *actual* medical professional. It could be anything; the human body is weird in so many ways, and as many of us here know, mind over matter... But since I doubt more than one or two hubians are employed in the medical field at all... Just go see a doctor about it. Phrase it however you like as long as it gives all relevant details (physical feelings, mental state at time of experience (and overall) and effects, emotions, your dietary habits, any unusual spikes of adrenaline you may have felt recently, recent troubling/traumatic experiences, etc).
"I like guided meditation with these elements"
"I play lots of relaxing video games that include X, Y, and Z"
"When I feel strong emotions, usually excitement or... 'excitement', I experience this"
are just a few examples. Or, if you're feeling exceptionally bold, just be 100% forthcoming and be like "yea, I'm into hypnosis, I watch a lot of audio/visual stuff for it, it's trippy, this thing happens. what do?
Hospitals/doctors aren't something everyone may be comfortable with, but usually they're just trying to do what they can to help within their means. If you must, get multiple doctors' opinions.
Hope it's nothing serious! Please update when you can!