I am not condoning any drug use nor am I a doctor; just a disclaimer before I post because I'm talking about me personally
I was on pain medication for over 2 years for VERY similar neck problems... I have had every kind of procedure short of fusion, such as countless nerve blocks, aggressive PT, a rhizotomy in a large area of my cervical spinal nerves. Also constant trap spasms and scalene flare ups. Chronic, constant pain. Degenerative disks and herniations and all that fun stuff.
Now, I've just finished a taper from Morphine and Norco 9 days ago. I am currently taking a 5mg dose of Valium (tapered down from 20mg) during the day, and I have been taking Ambien for about a year. Eventually these too, will be tapered down. There are possibilities of oversedation or worse if you are taking too many benzos (valium) or sleep aids together, but I don't think that is your biggest concern right now. You are at a low dose. Especially if you are taking the pills hours apart and not together.
I would advise talking to your doctor. I can relate to the pain you describe, and narcotics and steroids are not the answer to long term pain. But I know these medications can help- the thing is, there are supposed to be for short term use only... The longer you take them, the higher risk you run of dependence and ultimately, addiction. My guess is your osteopath was concerned about interaction and dependence. I would encourage open dialogue with your physican(s).
I don't know if I was of any help, but if you have any other questions, people on this board are great to ask...Wishing you a calm evening.