Why I'm I always so indecisive when making life decisions? Do I have a disorder that can be treatable?

I cannot make a decision without thinking that I will make the wrong one, or will loose out either way. This is SERIOUS and it affects eveything I do in life. If I come up with a solution about something, moments later my mind plays devils advocate and will "haunt" me about the why the other choice was the better. I often get headaches and stresses - even ponder. Can I get help gor this?