What Could Tingling And Numbness In Face With Headache Suggest?

Hi, I wondered if anyone can help me.
On the 20th December 2010 I had a blow to the head, I was not knocked unconsious. I went to a&e and they said I had concussion. I still had headaches for about 2 weeks and these passed. Then on 8th January I had a heavy drinking session and 2 days later I had a severe headache on on side of my face causing tingling and numbness, I went to a&e again had a CT scan which has come back fine. Now at 9.30 everyday I get this same numbness and tingling on one side of my face. I can now no longer drink alcohol as this causes the same symptons. Can anyole help?
Clare