Hi, I Am 36 Years Old With 2 Children. I

Hi, I am 36 years old with 2 children. I have been on petogen for 2 years. I skipped my shot for just one month and went back on injection after bleeding for 2 days. I still bleed after every 2 weeks just for a day even though i went back on petogen. When i bleed i also feel exhausted, have abdominal pain, running stomach & slight headache. At clinic they said it is hormonal imbalance but cannot be treated except to get a pill that stops bleeding. Please help. I want to try for a baby in 2 years time.