Please be careful, and get your physical health, as well as mental, evaluated. Willpower is fine to finish the last leg of a race or complete a difficult task but it is a short term power and not a way to get over anything that persists.
Willpower is overrated. You also need to be able to sit in the place you are in and see it for what it is for you and really think about what activities/other things have really helped... I think willpower, as we use it, can be linked cleverly to denial and a false sense of being in control.