Having chest pains for 4 days, help?

I've been having some chest pains for four days, and I don't know why. I don't think it's any form of cancer, cause I'm only 16. And I don't think it could be some sort of heart problem due to obesity, I'm only 130 pounds and I'm 5"10". Some have suggested taking Ibuprofen, but I've had it before and broke out in hives, some I'm thinking I'm probably allergic to it. I've thought about going to see a doctor, but not sure yet (The doctors in my area usually aren't very good at their job, don't know what's wrong, don't prescribe correct medications, etc.) Any suggestions?