Hey there,
I think that you need more actions than JUST DECIDING TO QUIT. Flash-backs won't help you. If you keep thinking about the 147 days you are injecting venom. If you do not change your lifestyle, So you will fail easily. Start some new things. Move your desk 30 cm, change your hairstyle, drink more water... I do not know! do new fucking things. Let your inner self know that you are up to a new life. Open up!!!
Wish you luck