please help diagnose me!
greetings, ill try to keep this short & sweet...for over 2 months ive been having issues...it all started out of the blue one day at 5 am when i woke up out of a dead sleep thinking i was having a heart attack - shortness of breath, heart racing, and an unexplainable sickly feeling, etc, but it subsided and shortly after i got the chills & had frequent urination(5 times in an hour). then when i finally got to sleep, i woke up in a puddle of sweat...the following day i felt like a million bucks. this has happened 4 to 5 times...and recently ive been having dizziness, lightheadedness, a discomfort in my chest after eating along with alot of burping and just a feeling like im not myself, sometimes like a zombie...ive lost 50 lbs in less than 2 months, which is good, but not under these circumstances...as a result of these "episodes" ive been to urgent care once and the hospital 3 times, having numerous blood tests, chest xrays, ekgs, ultrasounds on heart and legs, chemical stress test and even a heart catheter(angiogram), with the end result being that my heart is good and im a big guy(6'4", 450lbs) and still a bit worried about my heart, but the test results are reassuring...docs think its gerd or sleep apnea, i think it may be those or gallbladder, allergic reaction to lisinopril(for hypertension), anxiety, some severe digestive issue, or a combination...anxiety doesnt make sense, because im not panicky or depressed or stressed out...i know i need to lose weight but it seems like i felt better when i was heavier... is my body chemistry changing(im 32 years young)? is my body telling me to slim down? i cant go on like this!...any suggestions, opinions and comments would be greatly appreciated...thanks alot!!!