Are you Service Connected for any AO Presumptive Conditions?
Check in with Local DAV or VFW, DAV for sure has a shuttle service to your VMC.
You're 71 and on Medicare with both A & B coverage. Even if you're receiving VA Comp, probably should look into AARP's United Healthcare Medicare B supplemental plan. Cost's me about $145.00 per month for Full Boat, no Co-pay Coverage at ANY private Dr or Hospital that accepts Medicare. If you have Heart problems, you would be well advised to seek out non-VMC treatment. You want a Cardio PRO working on you, not someone just starting out or getting by.