Crazy Huh?
No it doesn't hurt. the staples are tiny tiny. they are applied in a log row,very closely together and you never even know they are there. the staple gun staples,cauterizes,and cuts the extra stomach off in one movement and that doesn't hurt either. the cauterizing is "burning" a surgical technique use for decades to seal off little blood vessels that bleed when cut. that doesn't hurt either.
healing starts immediately as does the production of scar tissue. most healing is complete in 4-6 weeks.
Unless you DH is trying to screw you thru your belly button,um ,no it shouldn't hurt either. You will never even be able to tell a difference from how a sleeve "feels" than you did with your whole stomach in there. there are youtube videos that show thew whole procedure from start to finish.