Pretty interesting scenario.
Because of the half life of dbol many will split what ever dose they take per day to sustain more sensible blood levels, that would definitely do the trick but not by friday bro... I don't think you can lower it by any means in just one day.
Imo best bet is to use some of the shorter acting testosterones ( obviously not nebido or similar long acting stuff ). Even a gel ( testogel ) will do the trick if your skin absorps it. With a shot wait for a 2-3 weeks and you propably are at the bottom levels ( i'm mainly referring sustanon 250 with the shot ) but it's impossible to say exactly.
Keep in mind that in some cases and countries the testosterone scales are bit different. My country doesn't specify them by age and that's a real problem. You could be on the low end in your 30's and most doctors will assume since it's in "normal range that can be found from males 70 years old" you're not having any hypogonadism etc.
There's still alot of doctors with minimal knowledge about testosterone and it's health effects rather than realize the effects of having low testo.
Bottom line, if you're on the low end and your doctor refuses to give you trt, you need to change doctors!