I'm sorry that you're having such a tough time. I have heard of people who suffer migraines without the pain. I suffer many of the same symptoms you have with the pain (unfortunately).
My migraines get worse in the winter as well and that is because I live in a rainy climate. When the clouds come and a low pressure system I feel like there is a vice grip closing in on my head which triggers a migraine. We visit Las Vegas twice a year where it is generally hot (or at least warm) and dry with very little rain. I generally have a week without a migraine each time we go because there are no low pressure systems that come in and squeeze my head.
It's just a thought, but I definitely feel a lot better in the summer when we don't have as much rain.
Good luck. I hope you find something to help you through.