What could cause upper neck/back of head pain, facial pains that come and go, muscle spasms, eye strain, could my meds been doing it?

Nerve impingement: Is a very common problem, affecting about 10-12% percent of the adult population in the us. Nerve impingement can be caused by being sandwiched between two spinal bones, pressed by a bulging disc or encroached upon by bony overgrowth. It can cause severe vision impairment and muscle spasms. Rec.: see an interventional pain management specialist for further investigation.