A light box can really help. This is pretty early in the year to be struggling with this, so I really encourage you to seek out help before it gets worse.
What about some sort of small bribe to help get yourself to the gym more regularly? There is a thread on the main cafe page with ideas for non-food rewards. One thing that can help is going directly from work to the gym--no stopping at home where you can get distracted and/or hibernate.
For what it is worth, I had a terrible time with SADD in my teens and early 20s, but in my 30s it hasn't bothered me much, even in years where I was living in a place with extremely overcast weather. I have no idea why this is, but just know that struggling one winter doesn't mean that you always will.
Dances: salsa (standard/LA), casino, rueda de casino, cumbia Colombiana, bachata, mambo, cha-cha-chá, merengue, reggaetón.
Currently learning: Mexican cumbia, danzón, Cuban rumba
Dances to Learn in the future: flamenco, tango Argentino, samba, belly dancing, bhangra, ballroom rumba
| current weight: 212.0