Hello,

Quite a challenging piece to review...

For me, the form ain't haiku, nor is the subject - so is the title ironic, that's lost on me?

We have a contemplation of the process perhaps? Diagnosis, prognosis and death..

Weeks end - why the brutal line-break right at the start? Give the reader a break and coax them in gently.

Silently; hauntingly, Alzheimer’s, rheumatism enter - not fond of all the 'telling' here with Alzheimer’s, rheumatism. Show these conditions.
These humbling evenings,
Leaving a sad tale: - again, this cliche is too telling, evoke the sadness.
Doctors and your senility. - same again with senility.

Endlessness, relentless, encroaches. - leave out the second comma?
Soon, under noon sun, even the - under noon sun sounds like a needless device for a rhyme. Another clunking line-break in a cheap shot at being poetic. Irregular line-breaks need to be a lot cuter than this. (see what I did?)
Afterlife nods defiantly - how is this insight into the mood of the afterlife wrought?
Heaven Ever After, violating every natural survival - heaven is nice, but I don't get the rest of it.
Habit. All lost. Lives shorten - nice end phrase, but for me it cuts against all the senility, which suggests a long life.

Toward end and rip - oh dear, an awful pun that is misplaced in this piece.
Us slowly
Apart. Sitting under nodding dogwoods: epitaphs, reminders... - nicely back to the contemplation here, perhaps use 'memories', to circle with Alzheimer’s?

Sorry to sound so harsh, but you have some nice ideas and a wide vocabulary and this piece just needs a bit of tweaking for me.

Good luck with the writing.................Em

My review has been submitted for consideration in "Good Deeds Get CASH!" .