I had a miscarriage 3 weeks ago

I only bled for 2 days no clots or heavy bleeding no cramps

Then after that since 2 weeks I am getting severe cramps pains badly , been in and out of hospital doctors they think it's to do with miscarriage and body getting back to normal.. pregnancy test negative , painkillers not working .. just don't know what to do .. has anyone else experienced this ???

Ps: when I did have a miscarriage they did a scan and she said no sign of pregnancy or sac but then again could only be 6/7 weeks pregnant .. all blood test normal etc

Pls help or advice what to do please 🤐