I agree with you. I'm already dreading the dark mornings and shorter days. We seemed to have our summer here early this year. The rain started in July and just last night I had to switch on the light at 7.15. It was a much better summer than we've had but the memories of last winter lasting 7 months is still very fresh in my memory.
I keep telling myself though, that the medication will work. I've done a very intensive 18 month MBT course, and I've to put it into practice now. It has worked during the summer, especially during a very distressing time, I just have to keep going.
Go back to your GP. If they don't know the more up-to-date meds ask them to refer you to someone who does.