Strange head sensations?!

I suffer from GAD and Health Anxiety and recently my headache has shifted into strange feeling. At first it was shooting pains in my head and now it’s like a weird feeling that almost makes me shiver. And when I lay down the back of my head Hurts. Also I feel pressure in my teeth. And I get a strange sensation when I close my eyes like I’m about to pass out. Does anyone else get this and is it anxiety?!

ARe you on any medication? Need more details to correctly answer your question.

I’m on lexapro and amoxicillin because they think it could be sinusitis but I’m not sick and don’t have nasal congestion or runny nose.