Neck Pain :: Headaches For 2 Weeks After Chiro?

Does anyone have any idea what might have happened to me?

2 weeks ago I was advised to go and see a chiropractor for a shoulder problem I was having.  He said he thought I had a trapped nerve in the C7 region. I said I only wanted conservative treatment so he used the adjustor (the little device that clicks and knocks agains your skin if you've seen one) down my neck to try and shift the nerve.  

When I got up from the table, I felt a woosh of heat and a throbbing pain at the back of my skull.  My whole head felt pressurised and my neck was very stiff.  The next day i had the same feeling, as though someone had punched me in the head and feeling dizzy etc.

Now it's two weeks later and no better.  The pain travels from the base of my skull and is like a stabbing behind my eye.

I should mention this is all on the left hand side.  I had to go to a and e it was so bad at one point and after basic tests they said I had just strained my neck and to take naproxin.  This is NOT a neck strain!  The head pressure is like a dull feeling over my whole head but particularly at the C1 area and behind my eye and is constant but ranges from tolerable to unbarable.  

My chiro said I must just have a sensitive neck..

Has anyone had anything like this happen to them?  I'm totally open to all ideas from anyone!  Could it be that he somehow moved a nerve which is now causing optical neuralgia maybe?