The medicine that they gave me makes me feel horrible and it isn't helping me anyway. Please someone let me know what they do or use for treatment options.

treatment options... surgical, pharmaceutical, behavior, and cognitive
case1... various types of pain from a below-the-knee amputation resulting from diabetic neuropathy.
case 2... acute pain from an abdominal hysterectomy.
case 3... chronic headaches (non-migraine).
using the treatment options what would best fit with each case