I have compressed nerves in my spine and it causes my nipples to be hyper sensitive due to the inflamed nerves. did injections once worked 1week help?

Unclear: The thoracic spinal nerves subserve the respective dermatomes of the chest, which are uncommonly compressed to produce a radiculopathy. Moreover, it is unclear how these become "inflamed" as a result, nor how injections (blocks? epidural?) were used as treatments. Suggest you visit your doctor who was involved in the diagnosis and treatment plan previously who has a full history on these issues.