If you go the doctor, there's a good chance they'll give you a disagnosis of IBS -- and then very little advice that'll actually help you. At least, that's what happened to me in my late teens -- same symptoms as you after a period of intense stress, got lots of tests done over the years, given the IBS diagnosis, and none of the doctor's advice did me any good.
In the meantime, advice from other people and common sense eventually got the symptoms down to close to zero:
reducing sugar intake (this helped more than anything!!!)
reducing caffeine intake
reducing beer and sugary alcohols (rum, etc) intake
reducing dairy intake
lots of peppermint tea
lots of ginger tea
eating more slowly/chewing more
avoiding stress (obviously)
I've seen several doctors over the years for IBS & Reflux ... Name a pill and i've taken it ...They all suck....The only thing you can do is find the diet that works best for you.....Caffeine,greasy foods,dark liquor and dairy are a bitch.