Periods ( TMI )

Hi, wondering if anyone has been in a similar situation. So I had my daughter 9 months ago, periods came back pretty quickly, but since having her I’ve been having month long periods with a break of 3 days in between bleeds. Been to the GP who won’t investigate until I’m a year postpartum. Wondering if anyone has been in a similar situation? Affecting my mental health so much now as it’s not just the bleeds it’s every single PMS symptom for weeks at a time. Never had this problem after my first baby & never had this problem with periods so it’s all a bit much for me lol! Thanks x