Multiple sclerosis can manifest with many different symptoms (including yours) depending upon the location of the brain lesions. MS can be confirmed with a CT-scan of the head and an examination of the cerebrospinal liquid derived from lumbar punition. You can visit a neurologist, ophthalmologist and ENT-specialist for full-spectrum examinations. It doesn’t seem likely that your symptoms are related to that lump on your nape. The lump can be examined by a general surgeon.