Another thought is you only have to get through one day at a time, really.
Just get through tomorrow, it's just one day. Then do it again the next day.
Think the worst possible tomorrow can possibly be in the very worst circumstances. Then think how likely it is those very worst circumstances would occur, then go on in and see what really happens. Before you know it the day is done. Chances are it wasn't as bad as you thought it could have been. Then you gain ever so slight amount of positive energy to do the same thing the next day.
After some time of this, you have a reserve of positive energy--so when a really really bad day does happen, you have the positive energy to plow through it and overcome it.
Befire you know it, three years has slipped slided away.