the5mills,   Thanks for your question.  First of all this is not a TIA which stands for transient ischemic attack, more commonly known as a mini-stroke.  I also doubt this is caused by your sleep apnea, because one episode occurred while you were "relaxing" at the computer.   Your history is complicated and you are taking several medications.  Though you have undergone a cardiac evaluation two years ago, this is still something that needs to be considered and ruled out.  IF your heart is OK, then another possibility is your gastrointestinal system, with gallbladder disease high on the list.  Other GI problems like reflux, esophagitis, ulcer disease, and delayed gastric emptying.   It is clear that you need to see your physician for an evaluation of your symptoms as soon as possible.  Chest discomfort is a symptom that doctors take very seriously, and it is better to be safe and seek help sooner than later.    I hope this has been helpful.  Best wishes.   Martin Cane, M.D.