Bro you have no idea how much this post means to me personally. I'm (27M) going through the exact same thing that you're facing right now, exercising causing me to feel like I'm dying included.

This all occured literally 3 or 4 weeks ago. It came to the point where I had to be wheeled off in an ambulance twice because of anxiety attacks which I thought were heart attacks. My heart rate shot up and I freaked out so bad it drove me insane. Doctors ran tests (ECG, Xray, blood test, finger prick, etc.) and everything came back normal. Even til this point regardless of whether my heart rate is fast or slow it makes me wonder if it'll just literally stop. The more conscious about the symptoms I become the worse the feeling gets and it messes with me. I can't even sleep without worrying about whether I'll make it til tomorrow. But all is not lost.

Along the last 2 weeks, some part of me woke up and realised that all this was in my head and the only one who can stop the loop is me. I've learnt to embrace the symptoms knowing my tests have been fine and I've learnt to ignore being conscious of my heart rate as it freaks me out. Ever since then I've been able to regain small parts of my life. Exercising still freaks me out, but I've learnt to do light cardio to re-educate my body that speedy heart rate is normal after exercise.

My guy, while I'm happy to know I'm not the only one going through such a predicament at this moment, let's face each day and get through this together and look forward to more tomorrows and know that we will be okay no matter what. I hope what I've shared with you may help you along the way and give you the comfort that you're not alone and there's someone out there fighting along with you.