Suggest Remedy For Constant Pressure In My Head

I've got a constant pressure in my head. It started as a toothache that was absolutely miserable for about six days, and then turned into a feeling of teeth growing, and eventually what I'm now feeling, a constant pressure in my entire head. It has been roughly 4 weeks since the toothache. It comes in waves spaced out between thirty seconds apart and five to ten minutes apart. I can feel my teeth being pushed together, as well as a feeling on each side of my head that there's a pressing in. Like a vice grip being slowly tightened. I've heard this is what a certain individual felt when he had a concussion, but I haven't hit my head on anything in over a year. Any other things that could cause this? I realize I should probably see a doctor, but my health insurance doesn't start until Oct. 1, and I simply can't afford it if I can be assured it's not an emergency and can wait!