Did you doctor reccomend, advise or talk to you about getting shots to alleviate pain, discomfort or other symptoms? Did you not get them because of this fear? This is generally a negative then for your disability claim. In some cases it can be a big negative. Talk to your doctor and/or a psychiatrist about what medications or other techniques you can use to overcome your fear. Which is worse? Fear of needles or the other pain you are experiencing. If you didn't get the shots then your pain must not be all that bad.
I'm busy working on my blog posts. Watch this space!