Hang in there, pepphel!!
A lot of us have those days. What I try to keep in mind is that in a day or so things will usually change. Just realize that your body is struggling, so you will have the good, bad & ugly days. Sleep whenever you can during those not-so-good days - they go by a little easier.
And, as Ginnia said, Tomorrow is another day.
Just try to treat your body as best as you can.
It's been said:LD patients can be as ill as people w/ congest. heart failure & in as much pain as post-op patients.