I have been feeling a lot similar to this lately, I have been taking 550mg of test e per week for about 8 weeks but I have been feeling as if I am struggling to catch my breath and that my heart is beating a lot stronger than usual when I am at rest. If I am up moving about or training it doesn’t seem to effect me but if I am just sat around watching tv etc I start to feel anxious that my heart is over working and feel that I need take a deep breath. Is this normal? I am 2 weeks out from starting my 12 week prep for a comp but if this is not normal then I don’t think adding in tren and competing is the best idea.