Health Issues Causing Severe Anxiety

This year my health has been taking a nose dive. I have fibromyalgia and have always suspected I have something else along side it but doctors have failed to diagnose me. This year I’ve been getting sicker. I’ve been missing a lot of work to the point that I had to go on intermittent fmla. I asked my doctor to run tests to see what was going on and she refused. I’ve been stressing out a lot about missing work and my declining health. I’ve had countless breakdowns because of how guilty I feel calling out of work all the time, and worrying that people at work look down on me because of it. Last Friday, things took a turn for the worse when I started having all the symptoms of a heart attack while at work, and had to be taken to the hospital my ambulance. I have taken the entirety of this week off to recover and I still can’t get over the guilt and anxiety over missing work. I’m extremely anxious about returning. I keep trying to tell myself my health comes first, but it doesn’t help. I also worry a lot that I can’t handle working anymore because of my health. Then I feel even more anxiety because I need an income. My boyfriend said he would take care of me if worse comes to worse, but I would feel too guilty to let that happen. I can’t get my anxiety under control and I really need to because stress makes my illness worse. I’m at a complete loss as to what to do right now.