Hello , I Am A 44 Yo Female On Chemo

Hello , I am a 44 yo female on chemo for CLL, also with chronic pain from fibromyalgia, bone pain from leukemia, neuropathy, degenerative cervical and lumbar disc disease. I have been on slowly increased doses of Ms Contin (currently 30mg tid ) and percocet (now10mg tid) for the past 5 yrs. This has managed to keep my daily pain to around a 4 on most days. My pain specialist recently changed my meds to stopping the percocet and decreasing in to 1 MS ISR 15mg qd. My pain is now a 8 sometimes 9 a day and the chemo is making it worse. (Chemo was started 2 mo ago). My oncologist won't consider working with my pain MD and thinks all pain is the same and my normal meds will work. My pain doctor only treats chronic pain and not acute. (Also won't put my previous dosage back even thru the chemo time frame). States my only option is methadone. I am scared. I retired from being a labor and delivery RN 5 years ago so I understand just enough pathology to be scared for good reason) My pain physician informs me my medication change is for DEA guideline changes only..which may be true, but I would like to hear another professional point of view on this topic.Thank you for your thoughts and expert opinions on this matter. SINCERELY, Wendy RN BSN