Other than depression, many other things could cripple you especially when you walk the path of a cultivator.
Wang Ling just did one of the many ways, by destroying his meridians he inadvertently set his future to its oblivion. Blood flowed out of his orifices, pain like no other assailed his senses and his body wanted to coil so he could cope with this sensation.
Add to the fact that the holy qi at this moment was wreaking havoc in his body, the pain was amplified multiple times over.
However, Wang Ling did not move. He kept his back straight, eyes closed, and kept on going with his cultivation because inside of his body at this moment was the incomplete formation of a gold-azure meridian system — the Overlord Lines was currently acting as the guide of his qi.
It was painful, yes, but Wang Ling bore the pain with greeted teeth.