Where do I go from here (details inside)

This is a follow-up question to this questions I asked yesterday. Instead of retyping all of that info, I’ll link to it. :)

Basically, this is my situation:
Got new glasses on Tuesday. They fixed the actual vision problems I was having, but they’re messing with my head and haven’t taken away the headaches.
We got the script checked and rechecked – it’s all good.
I’m drinking plenty of water (borderline too much actually).
All my nutrient levels are good.
I haven’t gotten hurt lately.
So what could be causing these headaches? I’ve been having them on and off since September or October. Every few months, we thought we had come up with a reason and a fix. Got glasses, got my wisdom teeth out, stopped drinking triple the amount of water I should be drinking in a day, started exercising on a regular basis… It’d help for a few weeks, and then it’d come back.
The headaches tend to be in one place or another – the base of my skull in the back, around my ears, the top of my head (one side or the other), around my eyes – not everywhere at once. It moves around.

I’m not trying to find the answer here. We’re going to talk to the ophthalmologist tomorrow or next week about it – maybe he has some ideas for where to go from here. We’ll probably then head to the MD.

All I’m hoping for here is some ideas. What might be causing the headaches? Why are these new glasses messing with my head like this?