What might this be.... a pain in my left side?!

What might this be.... a pain in my left side?

I have a pain in my left side... kinda lower and to the front. I'm an athlete so I supplement vitamin B12, creatine, and recently some caffeine and gugglesterones. I'm thinkin this my be the cause of it, but do I have anything to worry about?? e.g kidney, liver failure etc. It doesn't hurt much (I can take some pain)... but its annoying and it IS noticable. Should I go to the ER? ... I really don't wana ignore somthing that might kil em??? Sorry if I'm blabbering, I'm a little drunk. All answers are appreciated.

first off stop drinking alchohol. I doubt its helping you in anyway except possibly dulling the pain. If the pain is severe and has lasted several hours then go to the ER. there are too many things that could be happening. anything from a muscle strain or gas bubble to a serious infection can be happening. Take your temp, if it is elevated then quickly go to the hospital. Your ego can recover but you might not. Be sure to be straight with the doc. Let them know everything you have taken and give accurate description of pain symptoms so that they can best decide how to treat you. www.Wedmd.com has an interactive suymptoms guide. Also if you need to go ot the ER don't drive yourself.
btw- someone mentioned appendicitis. that typically presents as pain around the belly button then move to your lower right side. On rare occations you'll have pain on the left side of your body from that but you'd be so sick you couldn't eat or drink anything.