Hi there ...
I am sorry to hear about your issues .
First thing be positive , these symptoms are totally not related to your heart or heart attack , tingling , stomach upset , palpitations , indigestion are symptoms of anxiety , as you mentioned you are stressed and I want to reassure you that you have no heart issue .
I will suggest you to avoid coffee , chocolates , caffeine , cola drinks .
Cap Omeprazole 20 mg at bed time will take care of stomach issue .
Just try to overcome anxiety .
Get proper sleep , proper diet .
You will be ok .
Regards ***** ***** luck .
Please leave positive feedback for me .