It might sound a bit ungrateful, but I'm actually really sick of people trying to cheer me up.
I made myself worse the last couple of winters by not "allowing" myself to feel what I was feeling; in thinking I had to be everything other people needed me to be - cheerful, helpful, friendly, sociable...
I had some therapy earlier in the year and really worked on setting boundaries and being who I am, not who I think others want me to be; so now when people ask me how I am, I answer honestly, and say "I'm ok/I'm alright."
And immediately I get "oh no, just alright? What's wrong?" followed by attempts to fix me.
I've had to explain that for me, for this of year "ok/alright" is actually the best I can do, and if they want the "normal" sunny natured version of me, they need to come to back when it's, well, sunny.