triplesix -
you could be dehydrated.
Your sertoli cells could be still recovering from your last cycle.
You could try getting your girl to finish you off, and as you cum just squeeze the underside of the glans (between your thumb and forefinger, compressing your whole cock as well as the urethra) until your first 'pump' goes... then, time the release of your fingers with your next 'pump' and you should be cooking. Had the same problem (not due to gear, just had a bad spell for a while a couple of months back) and doing this made me hit the wall. Not metaphorically - I seriously hit the wall. My GF didn't know whether to be pissed off, shocked, or even more turned on!
-M