Wedding nerves!

So its 25 days till I DO. My fiance has been having anxiety attacks and its making me think bc of the wedding. I am trying to be as understanding as i can bc i dont know what hes going through but theh just started up maybe month and half ago and seems like closer we get to the I DO day hes worse. Hes gone to the drs few times bc meds arent working etc only thing seems to calm him is beer. And i dont mind but its putting damper on other relationship things. I want him to be calm and relaxed to but beer everynight to me almost feels like an excuse. Not saying he doesnt have anxiety but how is it that the meds hes on isnt helping but beer is i dont get it. If thats the case why take the pills that are suppose to help. He finally talked to his dr last week told him there not helping and so yea more new meds and still drinking. I dont know what to do should we call off wedding i dont want him having a panic attack weve been together almost 7 years and his anxiety has never been this bad ever! I know its a big day but i feel luke maybe hes second guessing rhe marriage thing and doesn't want to tell me or something. So many thought in my mind about this but trying to be there for support for him through it and its hard when your not use to it . I ask him if he still wants to get married he says yes but hes so miserable and just moody lately it makes it hard to enjoy the days up till we hopefully say I DO . Maybe once its over hell calm down i hope so bc this is crazy. I love him for who he is and delt with alot through these 7 years bc i love him . Is anyone else having stress related problems or anxiety problems and maybe explain it to me better bc to me drinking everyday is a problem if hes this bad then why marry me if your that stressed from it . Just having second guesses i think bc of this whole thing. Anyone else having second guesses or relationship problems bc its getting closer to date ?