I'm sorry to hear you're having a tough time. What you have sounds like it could be pericarditis, or inflammation of the lining of the heart. This can be caused by a number if things, primarily viruses and medications. Lyme disease can certainly cause inflammation of the heart and its lining, so I would certainly get this checked out. It usually isn't serious and is self-limiting, but taking some NSAIDs such as ibuprofen may help your symptoms. Best of luck.
I also get bouts of very high blood pressure (especially at night)