M1T for 4 weeks straight sounds rough. How far along your cycle are you? M1T without test or 4-AD sounds harsh on the sex drive. Are you experiencing major lethargy yet?
Only using Nolva is a crapshoot PCT for your cycle. I know people who have taken much more than Nolva and failed to recover months after their last day of PCT. I've done a 4-AD/M1T/M4OHN cycle and used Nolva, 6-OXO, trib, ZMA, creatine and maca for a 5 week PCT. It's been 2 months since the last day of PCT and I finally feel 100% recovered. I will be investing in some HCG next time around.
I also know people who have used Nolva only and were fine. Everyone reacts differently. Nolva will be fine for gyno symptoms, but the possibilities are endless for getting your boys working again ASAP.