Doctor's advice - intense weight loss / prescribed oxycontin/oxycodone?

My sister was involved in a serious motor vehicle accident 8 years ago and sustained injuries. After 2 years, she got pregnant and had a very painful delivery. The gynocologist prescribed her oxycontin/oxycodone for pain. Since then (6yrs) ago she has been prescribed these paralysing medications and she has built an immunity to them, so her and her doctor agreed that she should up her doses. She did not know that this drug could actually make you become addicted. She is on over 300 mg's of prescribed synthetic heroin and weighs a whopping 90 pounds, she has been loosing weight since dec.2011. All of her bones are showing, her shoulder blade rubs against her rib cage, her spine sticks out, she is a skeleton. The doctor said she has no time to care for her, after she prescribed her such a high dose of synthetic heroin. The doctor said its like a cold glass of water in her face. She told my sister to look up articles in magazines if she wants advice on saboxown a type of drug to help wheen patients off this drug. Now my sister has no doctor, she is left with one weeks prescription, she cannot cut off these drugs cold turkey, this is lethal to her health. She could even die because of her weight problem. She's been on these drugs 6 years, has never unused them, she has a daughter that is 6 now, and all she wants to do is to wake up and start her day. She does not want to take them anymore. She is more then willing to work with any professional to get off of these. The doctor up'd her dose 1 month ago and dropped her as a patient. My sister got her last appointment on a voice memo on her ipod, she cannot find another family doctor, she has called walk in clinics, crisis center, telehealth [ottawa,ontario], everyone has told her to go to emergency and the hospital told her they would not prescribe that to her. Is there anything she could do? Anyone know of any doctors that have the time to deal with her pain issues, she takes this drug for back and neck pain, so there is a reason for taking it. She will then have to deal with the pain and withdrawals. She looks really sick. But she needs the meds. She doesnt think the drugs and intense weight loss has anything to do with each other. This started dec 2010 - its now july 3rd and weighs less then 90 pounds. She is writing a letter to the college of physicians in ontario. She needs help asap. Could anyone help my sister?