help me

hello ladies I have PCOS I was diagnosed when I was 13 and I'm in 23 now it's been 3 years since I had a normal menstrual cycle. I have been put on Metformin and I was spotting or have a really light period for 3 months now and my doctor prescribed me medroxyprogesterone and it cost a menstrual cycle and it is extremely extremely heavy close to every 20 minutes I have to change my pad or tampon and I have a giant clumps coming out and I'm kind of freaking out cuz it's been 4 days now and I was wondering what this is normal because my doctor wanted to clean my system out because I get really bad cyst but I'm kind of freaking out has anyone had anything like this or taking the same medication if so please fill me in thank you so much!