I Am A 58 Yr Old Male. I Have Been

I am a 58 yr old male. I have been under a lot of stress in the past few years dut to family issues. I sometimes feel very tired, anxious, and feel that I have to hold on things when I walk so I won't loose control. There are days that i don't feel that at all or very little. I sometime feel I am out of breath and if I pressure myself physically even a bit, my heart rate goes up. Have gone to emergency a few times, and tests revealed nothing but have not gone to a regular doctor for more tests. I take xanax to control my anxiety. Feel very fatigue sometimes even if i splet enough and ok other times even if i didn't. very confused and alarmed about my symptoms.