I am under a doctors care, however, no answers yet. About 2 years ago it was like I hit a physical wall. Where I had felt young now I more then feel my age. I retain water and it gets harder to breath everyday (although my oxygen levels are normal). my resting heart rate keeps going up. It is over 110 now. I feel weaker and more tired daily. They have run tests and my heart seems physically fine. They just put me on beta blockers and more water pills. I have had Costochondritis for the same two years also, mostly over my heart. My blood diffusion is at 80 percent. I feel weaker and less able to function every day. I am so frustrated. Any ideas? Thank you, Bonnie