Hello,
I would need a little more information to answer the questions I think you have. The symptoms you describe are concerning. I would recommend that you see some one today if they are still occuring, even if that means going to an ER. It does not mean that it is your heart, but this should certainly be rule out.
I hope this helps.
Thanks for posting.
what meds are you taking, have you just started on them, if so that could be making you feel weak and tired. does your chest hurt or just arm, did you go to a cardio dr. they can run test and let you know its not your heart. wish you the best .