When you damage tissue in the body including nerves, the body sends out inflammatory molecules called cytokines. These increase histamine release and cause redness/swelling etc that we call inflammation. Sometimes these cytokines do not turn OFF, and go haywire, and then the symptoms become confusing.

The reactions following vaccines are often cytokines causing inflammation. People "say" they got the flu from the flu vaccine, but in reality it is the cytokine storm they are experiencing.

Some people are prone to this effect and it can be influenced by diet high in omega-6 fatty acids and low in Omega-3. Increasing Omega-3s and especially fish oil, may suppress some excessive cytokine signaling.

Being under stress and having alot chronic fear will also increase the inflammatory response. So doing some relaxation exercises, or learning auto-hypnosis can reduce these subjective triggers for pain. Some people have been here and found Yoga done gently improves their PN.

I hope you don't have RSD....once this starts, it can be a very long painful path. At this time no one really understands RSD...and so why it occurs in some but not others is still unknown. There is an interesting study showing that incidence of RSD after foot surgeries was reduced by giving Vit C before and after the procedure. I find that very intriguing.