Insane period symptoms.. HELP!

Priscilla • 30 | Happily married👰🏻 | mommy to twin boys born 8/19/17 👶🏻👶🏻💙💙 | baby girl due 1/23/19 💖
I could really use some insight.. Over the last 3 month or so my cycles have gotten longer they went from an average 28 cycle to about a 30-31 day cycle ( I know that's still technically considered normal) but my bleeding has gotten way heavier to the point I can basically fill a pad in no time (tmi sorry) and on top of that my cramps have gotten wayyy worse.. It's to the point I can't even function or leave me house I spend a lot of time with a heating pad or taking warm baths trying to ease the pain because I can't tolerate it.. Does anyone have any idea what it could be?! I tried to schedule an appointment with my obgyn but she can't see me till August or September so I'll be looking for a new doctor.. Right now any insight would be helpful!! 😩