Hey man, sorry to hear about your health problems. I would say the most important thing is to watch your stress levels. I know it's a bit cliche, but when you feel yourself getting stressed out, take some deep breaths and forget about whatever it is that's stressing you out. Listen to your doctor. It you need to change your diet, do it. More exercise, do it. Take your meds, whatever. Even if it means quitting smoking or drinking less.
I went through a pretty hard time health-wise towards the end of last year - nearly lost my life because I put off going to the doctor and didn't listen to him until it was almost too late. I had no idea that I was putting my life in danger. Luckily, it was a problem that could be fixed and I took the steps to do so before it was too late. I definitely will not make that mistake twice.
My father battled hypertension, among other things, for a long time and it led to a STEMI (severe heart attack.) Luckily, he made it out alive and did what was necessary to avoid future complications. He changed his diet, quit smoking, left his high-stress job in NYC for a job closer to home, started exercising, etc. now more than a decade and a half later, he is doing great!!
I wish you the best and hope that everything works out. If you need to talk to anyone, feel free to contact me.
Take care of yourself!