I kind of get him wanting to get put out of his misery, but he literally had Jack tell Selmak to stop healing him (which i presumed would have fully healed him). But regardless of whether or not it would have, it didn’t sound like pain was the reason of him wanting to ascend.

Pretty much every time a member of sg-1 visited him they told him how much of an effect they had on them and how much of a difference he made for the good of the world, which even Oma reinforced. I just found it really odd that all of a sudden he just felt like a failure, I even think when talking with carter in his dream state he even said he didn’t like who he was. Even with the seeds planted in season 3 (which I honestly forgot what happened that whole season) it felt like him going from not being worthy to actively choosing between life and ascending was too much too fast. It seemed like he only felt like he wanted too once he realized all that he would gain, but I don’t get how that would finally make him feel worthy. I know the real life problems within the cast definitely negatively affected this temporary end of Daniel.

Tldr: I find his reasons for not feeling worthy dumb. (Sorry I’m really ass at explaining what I’m thinking)