The first thing that popped into my mind when I was reading your post was my dad. For the longest time growing up, it seemed like more than just the trees went to sleep in the winter.
After almost a lifetime of this, he got an answer - of sorts: Seasonal Affective Disorder.
Seasonal Affective Disorder (SAD) is a type of depression characterized by a pattern of episodes tied to changes of season. Research indicates that SAD is caused by variation in the length of daylight, which affects levels of the neurotransmitter, Serotonin, in the brain. It can be very subtle or very profound depending on the person. In my dad, it was fairly subtle. In my Grandmother, however, it was extreme.
Now, I don't know your personal situation, nor am I saying this is your issue. However, a LOT of people do have different strengths and weaknesses tied to the change of the seasons.
There's a Spiritual side to this too, though. My Totem is Bear. As a result I tend to sleep more in the winter than the summer. You could easily say it has nothing to do with my Guide. It would be logical and scientific to say that what I experience in the winter is simply an off-shoot of me being genetically predisposed to SAD through my father and grandmother.
Maybe that's the case. But maybe, there's more to it than that. Maybe, the one is a reflection of the other.
In the winter, my Dreamtime experiences become very strong. I'm lucid more than I'm not, I engage spiritually more than at other times of the year, and most of the personal Medicine I get from my Guides, I get during this season. I recognize this, accept this aspect of my being and use it to better my life and the lives of those around me. Therefore, I'm "congruent" in my spiritual being - not depressed.
Perhaps for you, there is spiritual Medicine at work that centers around certain aspects of the seasons or the year. Perhaps the negative energy/situations you encounter is a result of you not being in congruence on a Spiritual level at that time.
In some ways, it's similar to what Rythman was saying about ego getting in his way.
Anyway, just my $.02. Take that for whatever it's worth.
