I had a severe headache and vomiting on Tuesday. I knew it was most probably a migraine brought on by heat and stress, but I just wanted to double check. So I turned to Dr. Google and found this site --- FreeMD(r). Basically, you can be seen by a "virtual doctor". It's an interesting concept. The virtual program interviews you, and then after getting enough information, gives you a possible diagnosis, tells you if and how quickly you should see a doctor, and presents it all in an easy to print out form just in case you need it as a reference. I checked my headache (I was right -- migraine) and also just for fun, my lower back pain.
My lower back pain, incidentally, was caused from poor posture in an abs class some time ago and can be relieved with a good yoga class. So I was pretty sure the issue is a tight back muscle, given that yoga pretty much fixes the problem. So after the migraine diagnosis, I ran the lower back. And lo and behold, it diagnosed me with "acute back strain or sprain."
Anyway, I thought it was a neat tool. What I like about it is that they give you an idea of how serious your problem is. For instance, for the lower back pain, they recommended seeing a doctor within the next two weeks; for the migraine headache, they recommended I see a doctor within 8 hours. Luckily my headache was gone in that time!