This happens sometimes. Not when I'm running only test but with Dbol added I've noticed that my heart rate goes up during the day once a while, and when it happens it's always at evening, so I agree on what Zylag said above.
Definitely get some cycle support supps, with products like N2Guard available today you can ease, or completely avoid most side effects associated with AAS use, which usually were nearly unavoidable few decades ago.
Before Internet, and cycle support supplements existed very few people who used AAS took anything for cycle support, simply because they either didn't know they even existed, what to take, or where to get it. Now it's almost the opposite, you can end up with information overload when trying to find correct information buried within heaps of misinformation. You have same kind of problem when trying to decide where and which products to get, while still avoiding marketing scams and other similar things that todays society which only bows down to the almighty dollar has consumers tightly wrapped in... Sorry about that, damn stims, lol!
That DMAA is some really strong stuff!
I had yesterday a PWO drink that apparently has a pretty hefty dose of DMAA in it, since I can ATM still feel the effects from it over 20 hours later, lol! Got to admit that I like the stuff, had a great workout yesterday, and slightly euphoric feeling throughout the whole day. Except when I went to bed I felt like I was going to have a heart attack for a while. Surprisingly when that feeling subsided I had no trouble falling asleep, just kept waking up every few hours though whole night (that's been happening for a while, probably because of Dbol). I just had a sample pouch of 1MR PWO, so without thinking about it I took the whole pouch, when using 1/3 or 1/2 at most would have been a good dose. Great stuff still, just have to dose it right next time...
Sorry for rambling "a bit" off topic,, lol!
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