Poor you. My old ma had this but neglected it, consequently was in hospital as the virus got on her cornea as well. She was badly scarred and had pain for years.
The virus attacks nerves, which is why typically one upper quarter of your face is affected. If you take your medication and slother it in zovirax from as early on as possible you should be OK - provided the rest of your general health is OK. If it isn't treated it can leave you with permanently damaged nerves.
It seems to be a symptom of stress, so as well as getting proper treatment for the shingles perhaps also taking time to reassess your stress levels might help. Good luck and get well soon.