What about making the most of it and getting outside anyway? I have a set of snowshoes for the snow and shoe crampons so I don't slip and fall. Even a short walk up and down the street gets you some much needed fresh air.

I suggest adding some vitamin D to your cocktail and using a therapy lamp for 10 or so minutes daily (if you are on assistance you may qualify for reimbursement of one of these). Having light, no matter the source, is vitally important to your mental and physical health. You are not doing yourself a favour remaining holed up in your home. I guarantee this is a reason for your low mood and that you risk outright depression. It is time to take some action to prevent this.