wintertime anxiety and seasonal depression

hello everyone! in recent years, i’ve always struggled mentally during the winter months, a lot like other people. i get very stressed (some because of school), more anxious than normal, and feel extremely overwhelmed. the past, i’ve struggled with cutting and an eating disorder, but this year, so far, has been alright. October was a great month for my mental state, but November started the decline. December has been the worst month multiple years in a a row. does anyone have any tips or products to help? thank you so much!!!