Mate if you have all the ancillary's that you need (Ai's, serm's), there is no need to stop the cycle. Just take your serm and Ai and that's it.
3 days however is extremly fast and imo frankly impossible. So you either had gyno before or you don't actually have gyno. You can not develop gyno in 3 days. Even if you had e2 levels at 200, 300 ... And besides the point, even if your aromasin is fake, 500mg test and 50 dbol can't arometise so much so quickly. And even if it did, as I said, gyno couldn't develop this quickly.
Agreed about the gyno not for ming in 3 days, but that said...it could have already been present from pervious cycling and introducing 4 hormone modulatoing agents could be *starting* to flare it up/kick it in.
I would drop dbol immediately, it is one of the harshest androgens out there, period. It may not be likely to cause gyno directly, but the human body has millions of pathways/millions of ways for **** to go wrong, especialy with dbol.
Drop the test e down to a total of 200mg per week, run for another 3 weeks.
Add in low dose nolva, ASAP/when it arrives.
3 weeks from now, drop everything and run a standard 4 week nolva PCT.
When that is done, run low dose clomid (TRT dosing) for 4 weeks.