I started to suffer from a thumping heart beat at night about one month ago. The thumping is usually in the left side of the chest but also sometimes in the right side. This has caused terrible insomnia and I only sleep on average four hours per night (and only after laying in bed for several hours awake). During the night I can hear my heart pounding and my upper stomach and lower chest area is also 'growling'. It's worse when i lay on my side. If I sit up or stand it's fine.
In the past week I have also started to suffer from intermittent chest pain, mainly on the left of my chest but sometimes also on the right. I have had many heart tests (echocadiagram, stress tests, etc) which are all normal. Cardiologist says there is nothing wrong with my heart and it must be psychological.
I gave up smoking just as the heart symptoms started (after 27 years). However to be fair, I was suffering from insomnia prior to this for many years, although not as bad. Daytime exercise seems to make the heart pounding worse.
I tryed "Alteril" is an all natural sleep aid...I too suffered from the same heartbeat in my ear when I lay down. Do a search/Google it..I have been taking it now for a couple of weeks and its works .Gives me a more deep sleep and I go to sleep much faster than before,wish I would have known before now I wouldnt have wasted all this time taking otc sleep pill thatare addictive.I just wanted to share ...I want to shout it to the world lol nothing like good sleep!
I have started having very similar issues - I suspect it's caused by low blood sugar. I discovered that if I eat sugar before bed, I wake up a few hours later with pounding heart, and feeling weird - sometimes sweating. Like a mild panic attack. Absolute worst is when I have Chinese / Thai food for dinner, and maybe some alcohol. I'm still looking for answers though to figure out if that's exactly what's going on. Never had this problem until recently. I do have constant heart PVC's, and all my heart tests have been negative as well. Best of luck!