How do you date someone who is constantly in physical pain?

I think I'm falling for my boyfriend. But the thing is, he has a lot of physical pain. He was on opiates for a long time when he broke his back as a teen. Went through multiple surgeries since then and it's still messed up. Did a lot of weed and narcotics. Now he just smokes his nicotine vaporizer and drinks.

To give you an idea, he has to stand up to have sex with me because of his back. And he's only 22. He gets migraines a lot too.
Does anyone have any advice for me? What can I do to help him?
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If you've dated someone like this, how did it impact the relationship?
How do you date someone who is constantly in physical pain?
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