IBS/Acid Reflux/Esophagitis - HELP!!

[ScaryPains]

Background
-Have a previous diagnosis of IBS, which causes diarrhea, 4 to 6 times a week after eating. Had colonscopy done 3 years ago, everything was okay, colon spasmed during hence the IBS diagnosis
-21 year old male, student at Emory University

Current
-About three months ago began to have major attacks of chest pain, with strong rapid heart beat. These pains got a lot worse with deep breathing but would pass in 2 hours or so at the most.
-I am having the same amount of diarrhea, frequent attacks as described, mild stomach pains in various locations, occasional pressure in my ears and a great deal of burping. I only found blood in my stool one time.

Doctors have visited (All at Emory)
-One internist about 5 times who has sent me to:
-Three cardiologists, have done blood enzyme tests, five EKG's, two chest X-Rays a blood CRP test and an Echocardiogram.  The echo showed a mild leakage in one of my valves but all else was normal, and I was told that this is nothing to worry about.
-Saw Psychiatrist who diagnosed as anxiety and panic attacks, tried Zoloft but caused a major rash.  He wants me to try Lexapro but due to the allergic reaction to Zoloft I want to rule out other Organic causes first.
-Saw Allergist who said I had mild restriction in the bronchial tubes, prescribed Advair which I am still taking.
-Saw Gastronterologist who did an Endoscope exam which showed normal results. However, biopsies taken showed that I have Acid Reflux and Esophagitis.  Have been taking Aciphex 20Mg a day for about a month now.

Current Medications
-Aciphex 20Mg
-Advair 100/50 - Two puffs a day

Questions
-Is the leaky heart valve something that I should be worried about?  I was told it was really something that just showed up on Echos.
-Is severe chest pain a common symptom of Esophagitis, Acid Reflux and IBS?
-Should I be taking an H2 Blocker?  I have tried Nexium, Prilosec OTC, Pepcid Maximum Strength however they all had a lot of side effects.  Pepcid complete helped some in the past, does this work with my other medications?
-Are there any other tests that I should consider?
-Should I try the Lexapro?

Personal
-Please any advice would help a lot, this is not how I want to spend my last semester of college, let me know all that you can. These attacks and persistent symptoms have had a major impact on my daily life and are making me miserable as well as affecting my studies.

[sportsco]

ScaryPains

For Anxiety I've tried; Prozac, Wellbutrin, Paxil, Lexapro, Xanax, and Xanax XR.

Prozac: Caused me to wake up wired, as if I drank 15 cups of coffee.

Wellbutrin: Suttle, really not effective with me.

Paxil: Gave me strange side effects but helped.

Lexapro: Surely would recommend.  First week or so may be strange, get passed that and you'll feel the benefits.

Xanax: Of course a great fix, but 1 leads to 2 and so on.

Xanax XR: The best yet from my own experience.

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For reflux symptoms, I get the best result from Prevacid.