Winni-Retired
For this winter, I would purchase some good thermostatically controlled heat tapes to get you out of the woods for now... Maybe a heat loss evaluation could pick up any problem areas, that could be addressed with insulation at a more favorable time of year.
I feel for you as I would leave on a two week snowmobile trip only to return home to find ice dams had formed and damaged the interior walls with water leakage.
Very definitely, keeping the roof temp closely related, inside and out through insulation and soffit venting is the cure.
Best wishes,
Terry