Sounds like it could be a multitude of things from depression, low vitamin D levels....insomnia....mono.....

I see you live in Canada and posted this a few days ago. What part of Canada? Do you go out in the woods a lot? Late fall is a peak time for ticks which carry Lyme disease to be out and into the winter they become adults. In upstate NY where I lived the chance of an adult tick having the bacteria for Lyme was over 80%.

I would go to the doc and get bloodwork done on all vitamins etc... to rule out anything big.