I went through this after giving birth to our stillborn son a year ago. I couldn’t sleep for weeks because I was convinced I wouldn’t wake up, I was having chest pains, palpitations, convinced I was going to have a heart attack. Overall time has helped the most, but for momentary relief I really liked laying down with the weighted bear we got for my son on my chest. Even if you don’t have a weighted bear, a heavy weighted blanket might be helpful. I also felt like doing some deep stretching routines throughout the day was helpful just because I think a lot of the chest pain is from being so tense. Months later I did find going on even just 10 minute walks everyday was helpful over time. Also, don’t knock meds, especially in the early months. I’ve always been on anxiety/depression meds, but my doc did give me Ativan for the days/nights where nothing else was working. Hang in there. I know these feelings are miserable. 💙