Your situation sounds like what my wife went through several years ago and is still fighting. Her immune system was apparently lowered (according to a couple of doctors) by being on a steroid for another medical issue for too long of a period of time. This brought on the shingles virus which even though she caught quickly she was in intense pain for 3 or 4 months. Like you she was just about bed ridden and this is what I want to highlight to you.
Her shingles pain seemed to be subsiding after 3 or 4 months then it got to a level where it stayed and has been there for 8 years now. Our conclusion is that something else kicked in and the theories are:
1: By favoring one side while being bed ridden she developed a nerve entrapment issue
2. By being inactive for such a long period of time she developed myofacial issues
Both of the above results in symptoms that experiences and can be easily researched on the Internet. So my comment to you is to keep as active as you can and don't favor any particular positions while recovering. I can't say for 100% this is my wife's problems but with all that she has been through these two conditions seems to make the most sense.