Do all semi conscious convulsions mean a seizure? ( T shot story )

(( TW: needles, emetophobia, medical emergency ))

I made the mistake of doing my T shot home alone. I was way too scared of the needle and pushed it in too slow I think. Before I got it in all the way, I stopped breathing and fell back onto the bed with the needle in my hand. I don't know how long I was lying there because everything sounded distorted and my eyes weren't all the way open. I was convulsing uncontrollably and was only semi conscious. As soon as I was able to walk I ran to the bathroom to throw up.

Obviously I went to urgent care.

The doctor said I stopped breathing and that's what caused it. His advice was don't stop breathing when I'm doing my shot and don't do it alone. My grandmother who is a retired nurse said I probably hit a nerve. The doctor said I didn't have a seizure because I wasn't peeing myself, but I am pretty sure I went to the bathroom before I did my shot because I was there to wash my hands. Not sure what to do. Should I tell my general physician about it? Or is it not that serious.

I have had these kinds of convulsions before, but that was I think a year prior to this. It was another time I stopped breathing and started convulsing immediately after. I didn't tell my GP about this one, I just wanted to pretend it didn't happen because it was embarrassing.