Sounds like how I felt when I would take too much, but I will leave the medical questions/advice to your doctor. Obviously they are affecting your health and making your life unmanageable. I know that feeling all too well. You can get past this and get back to being the mother you know you can be.
It is important to continue to be honest with your doctor and don't attempt to self diagnose. Also let your friend know you want to quit. As far as support goes you have lots of options (Pills Anonymous, NA, Therapist, SMART, Outpatient Program, Inpatient Program if needed, and keep posting here on SR).