Headaches from dabs

My last two dabs produced a throbbing headache on the left and right side of my temples. I did one on Friday night and within 20 min the left side of my head was pulsing. I brushed it off as a coincident. Last night the same thing happened again. Could it be from vaping residual alcohol? Never happened before and I've been dabbing some qwet for three weeks now all from the same batch. Any ideas?

I think ive this before and there was everclear left in my oil.

I now vac purge my alcohol oil overnight (let pump run for 5 mins, close valve, and sleep) I wake up and its fully purged, and a rock hard piece of glass even at full vacum at 110F.

I let it purge 12 hours. It wasn't hard but it was chunky and just how I like it. I might throw it back in the vac overnight. I looked up vaping alcohol and apparently it's a thing that people do. It felt like I was going to have an aneurism. I guess I was just paranoid. Go figure...get high, act paranoid, re-vac all oil!

Yep It has to be some solvent in the oil I've never had that happen.

Re-vac 4.5 g qwet. I hope this is the problem and not something else.

Wow it already smells so much better its incredible! Lesson learned!!! Vacuuming is no joke. Don't skimp on the vac time! I get careless thinking ethanol isn't bad for you. Its from years of being lied to about the difference between booze and weed