I keep getting major headaches and major pains. is there a cheap painkiller i can get otc?

Determine cause 1st: It's better to see a physician to find out what is causing it rather than to cover it up with long term pain medication (even if the medication was free)! if you let this go, you may have more costs from further and serious medical treatment and lost wages from missing work than the mere cost of otc pain medication. You should strive to be healthy and feel good.