Why does it feel like theres so much pressure on my head?

I feel like some one has their hands inside my head squeezing my brain the pain is bad I feel like A. I'm gonna vomit or B. Pass out.... I don't think its a migrain because I don't. Have sinsitivity to light or sound. What can I take to make the pain stop I can't have asprin because I have stomach ulsers. And regular tylonal isn't workin I drank a cup of coffee and notthings working not even to dull the pain a little. What should I do?