Selina: I am really proud of you for waiting out the met...it's a tough wait, I know! It was 3 months before I had AF, and i was on a higher dose if I recall your dosage right.
If it were me, I would give it a full 6 months, but I can't make that decision for you, because you're the one with the nasty PMS.
It's possible too that your dose is so low that you won't cycle...500mg is pretty ineffective in some ladies. You could also bring on a cycle with the provera, continue taking the met and let that met keep building in your system. Then after you cycle with the Provera you could see if AF shows up a month or so after that. With a cycle in the middle, it might be a more bearable wait.
Low carbing would definetly help (insulin is a hormone as KY reminded us), as it l/c lowers your hormones faster.
Hang in there, Honey, you deserve a medal for your patience!
Hugs,