DR TCB, you have every right to feel down, have a few moments of self-pity, or whatever...health problems ARE a downer, especially chronic ones!!
Regardless of whether your health issue(s) feel like they will never get better, or even if you know that they will in time get better...there are times that a person just feels helpless, sad, bitter, angry, or just plain uncomfortable and/or in pain.
You know we are all here with you and for you! Many hugs and vibes to you!