Why did God curse Martin Luther to shit blood, and is there a complete archive of his letters somewhere so I can read more about his crippling poop issues?

>'The Lord has struck me in the behind with heavy pain; my excrements are so hard that I am forced to push them out with great force so that I'm sweating. And the more I postpone it, the harder the excrements get. Yesterday I have defecated for the first time in four days. Because of that I could not sleep all night and still have no peace. Please, pray for me!' (to Melanchthon, 12.5.1521, WA BR 2, 333)

>'My ass has gone bad. The Lord visits me.' (to Amsdorff, same day. WA BR 2,334)

>'Today I have defecated the first time in six days, the stool was so hard, I nearly died. Now I am sitting here like a woman who has given birth: lacerated, wounded, stained with blood. Tonight I will not even have a little bit of sleep.' (to Spalatin, 9.9.1521, WA BR 2,388)

>'My anus and my stomach have finally made peace with me so that I do not need medicine any more. I am as healthy in all things as I have been before, thanks be to God.' (to Spalatin, 7.10.1521, WA BR 2,395)

Isaiah 59:14-20 still seems very relevant thousands of years later.

Justice is turned back,
and righteousness stands far away;
for truth has stumbled in the public squares,
and uprightness cannot enter.
Truth is lacking,
and he who departs from evil makes himself a prey.

The Lord saw it, and it displeased him
that there was no justice.
He saw that there was no man,
and wondered that there was no one to intercede;
then his own arm brought him salvation,
and his righteousness upheld him.
He put on righteousness as a breastplate,
and a helmet of salvation on his head;
he put on garments of vengeance for clothing,
and wrapped himself in zeal as a cloak.
According to their deeds, so will he repay,
wrath to his adversaries, repayment to his enemies;
to the coastlands he will render repayment.
So they shall fear the name of the Lord from the west,
and his glory from the rising of the sun;
for he will come like a rushing stream,
which the wind of the Lord drives.

“And a Redeemer will come to Zion,
to those in Jacob who turn from transgression,” declares the Lord.