sciatica or something else?

Sw

I have been experiencing horrific pain on my left thigh. It happens at night while I'm asleep, feels like my thigh is on fire for 5-10 secs and then the fire goes out for another 5 seconds. It's super painful. I'm wondering is this normal in pregnancy? Does Tylenol work for it? 22wks 4days...

I looked it up and it could be sciatica.