Concerned about side effects/complications of a Mylogram

I am desperately trying to find out some information about mylograms.
Some background on my situation:
I fell down a spiral staircase 16 years ago and went thru 3+ years of physical therapy. It seemed that over the years to come I would have off and on periods that I would battle with pain and then be somewhat okay for periods of time. In late 2004 I started to see a Neurologist that treated me with pain killers which I reluctantly used occasionally because of my fear of just masking pain and possibly doing more harm, obviously I got nowhere with him.
I began to see a chiropractor who had actually gave me some relief, but this was just temporary.
Then last September I reached the point of such excruciating pain that I could no longer perform everyday functions such as brushing my teeth or washing my hair, or doing anything for that matter, let's not get into the headaches. So I started to see an Orthopedic Surgeon has now suggested, after multiple cortisone shots, 1 shoulder and 3 cervical, and no significant benefits from them, that I have a mylogram done. Because of the variables of multiple neck problems - a 2005 MRI revealed at that time - Bulging annulus at C3-C4, Narrowing with eccentric broad based protrusion effacing the thecal sac and spinal cord at C4-C5, they list C5-C6 as unremarkable, so it skips! Then a right paracentral disc protrusion with increased signal compatible with an annular tear C6-C7. At C4-C5 there is moderate foraminal osteophytes bilaterally. Now, it's not only my neck I am contending with, but as we have found out there is also an overlapping injury in my shoulder that has become more prominent in the past 3 years.
The last MIRI in 2006 showed a markedly continual progression from the 2005 MRI. I have never heard of a mylogram before and have read some info that concerns me as far as side effects and complications of a mylogram. What am I to think when I read all these possible side effects, ( IE Seizures??) I don't know what to do, as I have no other alternatives anymore to surgery as my Orthopedic Surg. has told me. I already have muscular atrophy in my right arm and continual pain, so it does seem like I really don't have much choice anymore. I am only 39 years old, and I think "Where will I be if I don't follow thru with this come another 10- 20 yrs?" Can you please give me some viable idea of the ratio of side effects with mylograms, and what should be my honest concerns with complications?
Thank you very much,
Fiona