It's awesome news that your boys are aching so bad - it means they're pumping heavy iron right now rebuilding their size. Seriously. Doesn't happen the same for everyone, but in general it's not uncommon for pain to be a side-effect of change in testicular size.
Buddies last cycle was a bigger dose of Sdrol stacked with Epistane for a month (he bought one of those stupid pre-made stacks without even knowing what he was taking) *smh* His boys about disappeared. Got him on some Clomid couple days after he quit, along with an AI & DAA, & he was having terrible aches in about 3 days that lasted for over 2 wks. Said he was rolling with grapefruits afterward tho.