Hi chick - I also have quite irregular cycles - sometimes they're ok and are 38 - 40 days but sometimes they are 90+ days! It's so frustrating! I've been using ov sticks this month in the hope that I can pin point when I ovulate but I was unsuccessful and I'm now on CD32. So if AF arrives next week like she shouls I haven't ov'd this month! At least I have asome evidence if I need to go to the drs and ask for help!
I also tried AC a couple of months ago but I was so ill from it I don't think I took it long enough to get a result! I have no idea what else you can take to shorten or regulate cycles, but I do believe that there is something your dr can give you to make you bleed each month and also to ovulate each month - maybe a trip to your gp could be required?