I Am An 18 Year Old Boy Who Weighs About

I am an 18 year old boy who weighs about 140 and is around 6" tall. Lately i have been burping and yawning excessively. more than normal and i would like to know if i should be worried about this and what could be possibly causing it. Also i lift weights every day and recently when i lift weights i get a sharp and very bad pain on one side of my head. its like a lot of pressure is being pushed onto that side of my head. what is the reason this happens?