Ultracet and tremendous pain

I have had moderate to severe pain in my hip due to joint deformity and subsequent deterioration and arthritis. I am unable to take even one dose of any NSAIDs as they cause stomach bleeding. Ten months ago a doctor prescribed Ultracet for me and it has provided tremendous pain relief for me. However, one of the side effects that I first noticed was it aggravated neck pain that I had from a couple of degenerated disks. I couldn't figure that out until a few months later when I read the Ultracet could cause muscle tightness. That explained that, and that finally subsided in the last few months. I had some of the side effects others described the first couple of days but then they subsided. I find that if I stick with just one tablet nstead of the two prescribed, I don't have all of the central nervous system reaction that some describe...nerve twitching, itching, sleeplessness and agitation, but if I take 2 at a time, I have all of the above. I always take one in the morning and usually don't have to take another the rest of the day unless I overdo. Sometimes I will need to take more doses but I take it knowing that I will be itching and agitated. I have had a couple of doctors since that have had bad experiences with Ultracet personally, and they always try to switch me to a narcotic. I have not had any decrease in effectiveness or increased need or dependency, but I also figure that if I only take my one in the morning on a normal basis, and only supplement as needed, I won't have problems with addiction.