I'm afraid I might've had a seizure in my sleep, how could I be more certain before I see a doctor?

I woke up with a huge lump/bruise on my chin, the only thing harder than a pillow anywhere I could’ve hit was the windowsill over my bed, but it’s about 1/2 foot above where I rest my head, but still not too close.
I wouldn’t jump to conclusions, but the medication I’m temporarily on can cause seizures, I’m under extreme stress, the twice within the week leading up to the incident i went around 48 without sleeping, I wasn’t eating much at all, and I had hit my head and blacked out a day or two before. I was also very concerned with what I’ve heard about seizures from serious alcohol withdrawl, and considering I quit drinking the day before…?
Anyways I just want to know any/all symptoms.