Dbol won't bring your e2 up itself, rather it aromatases into methylestradiol so whilst your test is converting to e2 and rising back up, the dbol does get you estrogen into your ASAP.
It work's, based from experience. It's fast and effective. If you've dumped your e2, the quickest and most easiest/efficient way is to cut the AI out and throw in dbol. You'll go from low e2 to feeling good again by the end of the day. Other than that, something like test suspension would work too.. Probably even better than using dbol alone for it. Becareufl though, you don't want to over do it and give yourself gyno or worsen pre-exisiting gyno.