those are great questions.
i imagine there are multiple answers to them, depending on your mood. when i'm low i tend to think that change is not possible, but the facts are that all the evidence proves otherwise. it *is* possible to change, to recover, to reinvent ourselves.
for myself, i couldn't think my way out of depression, at least at first. i had to start with 'action' -- walking, sleeping properly, proper diet, meds, scheduling things to do all day to keep busy. the more i thought, the worse i felt. it was like being in quicksand, you know, like when you struggle the sand just gets tighter and you sink even more. in a way, i had to stop thinking for a while (not forever) and just get on with basics. i didn't wait until i 'felt' like doing the things on my list, i just got on with them.
once the depression lifted a little bit i started therapy so i could work on my thinking. so maybe you are right, be thoughtless for a short while, and then return to the questions once you feel a little better.