I feel your pain.
About 5 years ago I started having pain in both shoulders when pulling the trash cans to the road. I had a routine physical soon after that and it was odd enough (and recent enough) that I discussed it with the doc and we both agreed it didn't fit for heart issues.
Last July work started sending me to Toluca Mexico every other week. Toluca is at 9000' so everyone has breathing issues for the first couple days but I could still feel it after 2 weeks down there. So, again at a regular physical, I brought it up. Doc said, let's send you for a cardiac stress test.
I had the last appointment for the day on Monday before Thanksgiving. I spent the morning framing a chicken coop before heading to the appointment. I stopped shortly into the third stage, so about 5 minutes in. But both guys were really watching me when I got off the treadmill. After a couple of minutes I felt fine again and one of them left with the EKG to call the cardiologist. He comes back after a few minutes and says it doesn't look normal so they're going to take me to the ER to do some blood work. There is a protein they can get out of the blood that the heart make when it's "unhappy". The threshold is 20. First draw I'm 9, so good. But no, they have to wait an hour and do another. That's 18, so not so good. They hold me for another hour and it's 38, so now they are going to admit me. Except I'm in the local little hospital with no cardiologist, so they're transporting me to the main hospital 20 miles away, and the ambulance is already on it's way to get me. At this point it's already 11 at night.
It takes a while to get processed so I bounce around between rooms all night before finally getting a room in the cardio wing late the next morning. Late Tuesday afternoon they do the dye test running a catheter up an artery in my arm to inject dye into my heart while watching it on an x-ray. 100% blockage in the 4 main feeds and the next 3 are at 90%. So too far gone for stents they're going to open me up.
They schedule me for bypass surgery first thing Friday morning. At this point it's Wednesday morning, I have surgery Friday but Thanksgiving is in between. But despite me feeling fine they won't let me go home for dinner.
Late Thursday (8 pm?) the doc comes in again, to tell me he's got another patient in ICU who's in really bad shape so I'm moved to second operation of the day.
Surgery all went good, they had me up and walking Friday afternoon, dragging an IV pole and a walker. Instructions said 5-7 days in the hospital. They were going to release me after 4 but my heart decided it wanted to run at 120 that morning instead of the 100 it has been running so I got kept for the fifth day. Walking laps and looking at the other patients I was the youngest one in the cardiac wing by at least 10 years, so it didn't surprise me that I was at the short end.
6 weeks off work covering the holidays and then back to work. Evidently my boss also had bypass surgery several years ago but had a heart attack before and issues after so he was off work for 6 months, so he was really surprised I was back already.
Stamina is still down a bit but it's getting better. In general I'm feeling better than I have for years. Coughing is only uncomfortable now but sneezing still hurts.