I'm experiencing numbness/tingling of my face, fingertips, bottom of my feet. its sporadic. i also have sciatica. what could be wrong.

Evaluation: This constellation of symptoms need to evaluated further by a physician. There are several possibilities some more serious than others. A proper history and physical exam would narrow diagnosis and help target therapy.

Sciatica: True sciatica is leg pain that shoots from back, down the leg past the knee. This mimics the path of the sciatic nerve, thus it's name. Mri of the spine or pelvis would serve to differentiate in most cases if exam and history is not clear. If this is your primary pain, it may cause anxiety which could be causing the other symptoms. If the opposite is true, could imply spinal cord or brain issue.

Back & Neck: Issues are the cause of your problems. I would suggest seeing a spine specialist that an evaluate both of these areas to address your issues.