Since a few days I've been having some weird, uncomfortable feelings in my chest. It feels like a sort of pressure or sometimes a short, mild, stinging pain. It decreased a lot today which made me worry about it less but this evening I also had a similar stinging pain in my left arm which made me worry about it more again. Anybody ever have problems like this, too? Do I need to worry? I mean, heart problems do run in my family... But it could also just be a reaction to stress as I've been under a lot of that recently?