It sounds like you need support right now, so I'll try to do that while offering a basic suggestion.
I think we empaths need regular hugs and/or pats on the back. Because life for us can be day to day challenging. Every day we wake up we don't know whether to expect the worst. Will it be a good day? Will it be a bad day? We just don't know what energy we'll encounter each day and where it will lead us. And since we are energy sponges that tends to focus on picking up and removing low energy, we quite often get the blues, and get run down from just being us. So all I can say is great job, being you. And many thanks for the contributions that you are making daily to better the lives of people around you.
As for your comments on seasonal changes impacting you, I have a couple thoughts. First off, in analyzing the words in your post, you mentioned "I think this time of year is when I am most vulnerable." But then the later 2/3 of your post did not really mention how this season brings you down. You instead noted how voices and people are impacting you during this time. And that you'd rather not interact with people right now.
I have to assume it's the start of fall where you live (correct me if I'm wrong). And fall can trigger a change of emotions for a lot of humans. Summer is a fun and exciting time. The suns out. People moods are generally good. Most people fit in a vacation. It's a great time. And when that party ends, fall comes and it starts getting cold, and the sunlit days get shorter. Flu season hits. And many people do not do well with Thanksgiving, Christmas, New Years for a variety of reasons. In general, there's more moody people around in fall. More low energy to deal with. I could be wrong, but I don't think it's the season changing that is so much a problem for you. It's how your subconscious has remembered in recent years how tough it was being an empath during fall when you have to deal with the mood changes of the people around you. I see it as a people energy problem, and not the season itself.
I think the good news is that by recognizing the problem, you can find ways to counter it. Maybe staying at home for a few days here and there to recharge yourself by doing things that you love isn't such a bad idea. Its pretty well documented that even when empaths have only one other person with them in a house, that they are "on" and are not relaxing their brains. Empaths need a "me day" with no one else around just to recharge (as often as possible). And every season has some great parts to it. Whether its hiking in the woods enjoying the changing of the leaves on the trees. Or decorating for Halloween while sipping pumpkin spiced latte. I'm sure there must be some things to do in fall that you really enjoy. The point is to try to flip your mindset from "I really don't enjoy this season" to "wow, I just had a great time hiking in the woods enjoying nature in the transition of fall and it was a terrific time". Life is about creating good memories. Try to off-set the moods of people around you with some terrific seasonal memories focusing on doing things that you love to do. Things that revive and inspire you. And as an empath, it's all about keeping our vibrations high no matter what the season. Do that by doing things that you love. Things that make your heart and soul sing.
Best of luck. Be happy!