Asa's feet

2 Chronicles 16:12 states:
In the thirty-ninth year of his reign Asa was afflicted with a disease in his feet. Though his disease was severe, even in his illness he did not seek help from the LORD, but only from the physicians. (NIV)

Question: Why didn't Asa seek God? He was one of the few God-fearing kings that we read about in Chronicles/Kings. So, why not seek God for a personal problem? He had seen God work before? He had heard of God's mighty works for his people: parting of the sea, deliverance from enemies, manna from heaven, etc. Couldn't the God who parted the sea help him out with his feet?

A few verses before (verse 9) says:
For the eyes of the LORD range through out the earth to strengthen those whose hearts are fully committed to him.

It is always interesting how matter-of-factly these statements are made. If the strength of the Lord is such an available commodity, then why didn't Asa seek it to help him out with his foot issues?

What is it in a person that causes them to stretch out to God for help? Conversely, what is it in a person that causes them to not reach out for aid in times of trouble, and to seek a physical/material solution - something more tangible?