Headaches post LASIK. About this?

I went through LASIK 10 days back. I started getting severe extremely painful headaches at the back of my head. There's not a minute when I don't have that headache. No pain killers provide relief. Have been applying eye drops regularly. I've not heard of anyone getting these headaches. I even hear crackling sounds in my head as if the nerves or veins are getting a crushed when I move my head. Eye pressure was 18 when last checked. Changed drops, but no luck. The eye surgeon isn't saying anything. I need a second opinion to consult if it's because of any nerve damages. Which doctor/specialist should I consult about this? I don't want to go to any regular eye doctor. Any information would help as I feel handicapped and cannot do any work with these headaches.