Illing

Why can't my body just cooperate,
Be good, be well, and not let illness in?
I wish it would maintain its normal state,
Remaining just as healthy as its been
And not slough off good health into a waste
Of painful sickness and slow misery.
I have had health - a long, delicious taste
Of how my body always ought to be -
But now I fear I feel it slip away
And in its place such aches and pains I long
To be at peace again. Is there a way
To make my body right what now is wrong
And feel the comfort I was wont to feel?
If so, what is it? Not, how do I deal?