Had a heart attack several yeas ago, got stents with PCI, now doing well. Taking amlodipine, entresto, farxiga, spironolactone, and metropolol. To the extent that the main issue is keeping BP down, can someone explain what all these meds are for, and why they are all needed? My medical support group doesn't seem to be able to offer clear explanation. They're all good for you, they say. I'll accept that, but different meds should do different things. What are those different things?