I started my period on time but it barely lasted a day. Then I passed a blood clot the size a quarter then nothing. Have been having bad headaches and back pain for the past few weeks. Any advice?

When l was 16 l was in a serious car accident my spleen ruptured and l had to have surgery after that my periods were very abnormal up to 14 days l became anemic and now take multivitamin w iron um but since lm on the shot depo um l just started bleeding as if l have my period and l have huge blood...

And a stomach ache right before it came out I felt like I was going to throw up I was supposed to get blood work done a long time ago but didn't I was on iron pills for anemia but I stopped taking them I got off birth control because it was making me gain weight I don't feel good And I'm...