Dear friend, welcome and thanks for entrusting your query here at HCM!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your query here.
Your pain and tightness could be most likely from anxiety
is not likely.
A heart related ischemic pain is a possibility and needs an EKG to look for it.
Try to relax, take a mild anxiolytic like alprazolam 0.25 mg at night if your physician feels it ok.
If symptoms are persistent, get evaluated. Check BP, EKG.
I hope you are fully satisfied with the guidance I gave.
I would be glad to answer any further queries. May I request you to rate your experience here before you close.
Thank you and Good luck!