Welcome to HCM.
You have already mentioned that you have anxiety
attacks. Anxiety could be responsible for most of the problems you are facing, including inability to sleep on left side. Avoid sleeping on left side, would be the best solution.
You have to get detailed investigations done including ultrasound
study, chest X-ray, gastro-scopy etc. to rule out any organic cause. If all the tests are within normal limits, then it is the anxiety which needs treatment and not your other symptoms.
Wish you all the best.