about two years ago l started realizing this and it seems to be getting worse and worse. ive gone to a doc and they tell me im stressed. give me pills. they seem to not work. when l lie down they are fast very fast thumps and now its to the point that when l lie down on my left side especially it hurts terribly bad. now l had a boyfriend within all this that was a jerk and it seemed when he was physically hurting me it was not as bad he'd always aim for my left chest area, and rib/lung area. the thumps get agressive with me even more. l hated it and dont understand it.

You will require a Holter monitor test, and other investigation e.g. echo cardiogram, etc.
Consult your doctor.