I had SEVERAL failed attempts and never could seem to make it past the first day. Finally I have been successful and now I am on day 5. That first day truly was the hardest for me too! If you can make it through that initial rough part, you really start to feel good. My coworkers keep telling me I look great and seem sparkly and perky. I am working full time too. So when you are ready to do it again, maybe try starting on the weekend so you can get a handle on in it before starting work again.
Good luck. -Barrett