This request is one of the things that hypno can't physically do / change. Closest you can get is to find out the exact cycle of a real woman, and just stick a tampon or pads for your arse during that time.
As for mentally 'believing' that the period is real… try using audacity to make a file with those results. It is a bizarre enough fetish that there are not many (if any) files out there so making your own is probably best. Besides it will be more personalized for you that way.