Bulky uterus with heterogeneous myometri

I had 25 days menstruation circle earlier.but from 14th March to 9th April I am having 3times periods ranging from 3-4 days and it occurs on 14days of last period I.e on 14th March then 27th March and then again on 9th April.I have lower back pain also. Sometimes  heavy bleeding occurs with clots ,need to change pad after 2-3 hours and sometimes full day only one pad.I do ultrasound of whole abdomen.I can attached it too and also I am under supervision of Doctor too.I am taking medicine of Meprate tab from last two days.But things change adversely.after taking Meprate heavy bleeding occurs frequently with clots.I am very much confused as well as nervous what happened to me? I am attaching my ultrasound report as well as prescription too.Please go through thoroughly and advise me so that I can get relief a bit.My cycle didn't vary earlier and I didn't feel any such discomfort earlier.Now I am experiencing lower back pain as well as fullness on lower abdomen.