Sensation for past week that there's a hair/ thin string wrapped around my toe, but there's nothing there! Intense upper body pain as well. Why? Thnx

Neuropathy. Nerve pain of the motor neurons can cause these weird sensations. You will need to have a NCV test of both the lower and upper extremities. Seek out a neurologist who can perform the test. You may want to explore Vitamin therapy for the nerve pain. .