Since there are no pain receptors in your brain then the sensations must be felt outside the skull. There are many parasites which have been found in brains tho it is not common. Hulda Clark found a good number of parasites in the head - sinuses, eyes, muscles, etc. Most of them were eliminated using parasite herbs and supplements and Clark's Zapper. She wrote that dog Tapeworm larva in the brain could be treated with herbal/supplement remedies. Tapeworms cysts however would have to be removed surgically.
What you may have is a peripheral neuropathy and there are many causes tho parasites could be involved.