possible prolapsed urethra?

hi everyone! today I noticed that my cat is unable to properly sit and that he's walking very slow. i saw that his urethra(?) is sticking out a bit and am now worried. we've been checking him for days now because he licks/grooms himself a lot down there. he was fine yesterday and there was nothing sticking out. i googled a bit and it shows me different answers. i would take him to the ER but everything is already closed and the nearest one would be a 2.5h hour train ride away and I don't want to put him through more stress with such a long ride. does anyone have any suggestions as to what I could do or tell me if it's already a reason to worry since it's showing in his behavior already? I would be so thankful for any kind of help!