I deal with this too, and the only thing added to my med combo has been a high dose of vitamin D. You live fairly far North, like I do. Have you had your D levels checked? I was also told to buy a bright sun lamp. These things have helped to some degree, I think. It certainly wouldn't hurt to have another conversation with your doctor about the fact that your SAD this year is worse than it's been.

Hoping you get some solutions soon.