I understand how you feel. I am experiencing something similar. Pressure in my chest, strange feeling in my stomach and in my lower legs. Doctors don't know what is it. On one occasion they thought I'm having heart attack, they put mi into hospital for four days. Luckily I didn't have heart attack, doctors were wrong. Since than I am working to lower my weight and lower the stress. I also didn't care about myself for last 10 years, too much sitting and eating unhealthy food.
I hope I will win this fight because of my kids. I don't want to leave them unprotected. I want to live long enough to see their kids.

Congrats on the space dolphin status! :)