OP be careful bro.
without writing a novel, ill try to share what happend to my 22yr old buddy and training partner about 3 months ago.
we were about half done with our regular back routine, doing seated rows. on his 2nd set (i believe) about 3 reps in, his heart rate starts gradually increasing. no big deal, right? a few more reps and its really starting to beat fast, and is increasing as the seconds tick by. he stops and just sits on the bench because he was starting to feel light headed and faint. a minute or two go by and his heart rate is STILL increasing. he wanted to tough it out, and finish the workout but i insisted we stop and call he call his dr. if his heart rate didnt at least level off or start to go down.
to make a long story short, he collapsed when he got home. his mother called an ambulance. when they got there his heart rate was somewhere in the 300 beats per minute range! they had to use a difibulator to stop and restart his heart (only after every medication they tried did NOTHING). he'd be a dead man had the paramedics not got to him when they did.
the official diagnosis was WPW syndrome (google it). he had two heart surgeries-catheter ablations (the first was not 100% successful) and is just starting now to train again (his injection rate was still VERY low up until about 2 weeks ago).
his condidtion was 100% genetic and had nothing to do with juice (he was on test E 500mgs week only - it was his 2nd cycle).
I guess i am sharing this story because the moral of it is that when it comes to your ticker, DO NOT mess around!!!!! be proactive, if you even THINK something MIGHT be wrong, get it checked out. your heart is nothing to take for granted...