Is it all in my head? Yes. The brain is the final gatekeeper to the perception of pain. In other words, pain may not always correlate with the amount of damage dealt at the level of bones, muscles, tendons, ligaments, etc. There are reports of incidences where victims were stabbed from behind and have not noticed the blade or complained of pain until they were bought to the hospital for care! This illustrates that the brain could sometimes play tricks on us, and it is our upmost responsibility to educate ourselves properly.
I am not telling you all to ignore your pain, but do know that it is possible to reduce the sensitivity to pain by thinking more positively & educating yourself as much as possible.