Try to stop worrying - I am not medical but it would appear this is telling you heart wise everything appears normal so they will need to look elsewhere for the cause of the numb arm, chest pain and collapses. Have you had a chest x ray recently? Just a thought - everyone I saw after my heart attack ordered a chest Xray as well as an echo..... you must see your doctor to get this explained and for a plan of action but try not to get yourself too wound up and try to relax on a lovely sunny Sunday. Easy to ay and very hard to do but try.
Once they explain it to you you will feel much better. I find it is not clearly being told what is going on that makes everything seem worrying; at least after your tests the doctor's will be able to tell you a lot more. Take care.
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