Pain management and getting a life back

I need help dealing with the pain. Been having severe severe cramping (seeing lights missing work kind of pain). Saw an OBGYN who put in an IUD last month. My period came but I continue to bleed (3 weeks now, light), and have cramps that slow me down and make it very hard for me to move. I do walk about 3-5 miles a day, but I need to do more to loose weight. My yoga has fallen by the wayside, all because I often end of crying when I am away from my heating pad. Please- what has helped you beat the pain and get back to life? Thank you!