FAA Medicals
An FAA medical is just a thorough physical exam. Assuming you're a standard healthy college student, you won't have any trouble passing it. Chances are, your own M.D. is more thorough. Many people recommend taking a physical with your own doctor before taking the FAA physical, but that applies more to older people and/or those with a known physical defect. Doing that will give one a handle on any problems that must be addressed before seeing the FAA. Once again, if you're a standard college student you'll probably do fine.
You absolutely, positively have to be honest with the FAA regarding any health conditions you may have. A couple of disqualifiers that I can think of include mental illness, neurological problems, heart problems, and some vision problems. Surprisingly, the FAA permits people to fly with health conditions you'd think would be disqualifying. People fly with bad vision. People with high blood pressure fly. People who've had heart attacks fly, but they have to jump through a ton of bureaucratic hoops to get there. People who are taking many different kinds of prescription meds fly. People with hearing loss fly. I believe that diabetics who are controlled by diet can fly. The long and short of it is most people who want to fly can get a medical certificate. Some have to jump through more hoops than others to do so.
If you are indeed looking at a flying career, I'd suggest you get your First Class Medical right off the bat. You will need that grade of medical to fly for the airlines. It's better to find out sooner than later if you qualify for a First Class if you're considering a career.
www.leftseat.com is a decent website on FAA medicals. If you are at all serious about doing any kind of flying, professional or otherwise, I'd strongly recommend that you join the Aircraft Owners & Pilots Association,
www.aopa.org. I say that because AOPA is one of the best resources around for aviation information, medical concerns and general pilot issues.
This is probably more information about medicals than you wanted or needed, but I hope it helps. Medical certification and its ramifications are a major pilot issue. Good luck with your first flight.