I got my oximeter about a year ago and it has saved me so many trips to the hospital. When I get really bad chest pain or have a full blown panic attack I slap it on my finger and check my blood oxygen. It helps me to calm down and has stopped me from rushing out the door to go to a hospital. I also have a blood pressure reader as well to help me see where I'm at just incase so that way I have two things I can look at to help me calm down but usually I just go for the oximeter, it's a quick way to chill your ass out and comfort you seeing your blood oxygen levels.

For around just $25 you can get one on Amazon, I even recommend getting two if it helps and you can afford it so you can double check, whatever makes you comfortable. I just take mine off and put it on the other hand to make sure I'm at where I should be. 

This little device can be a lifesaver as well, where in the event IF you do actually have a heart issue you can catch it and get help quick. Word of advice though sometimes it may not read right, take it off your hand let it turn off, turn it back on and put it on or just leave it for a bit and it will sort itself out. 

Goodluck everyone!