I know a little Japanese, so I basically could read the comic (though I had to look up dainyoudouen, ha)
大尿道炎: severe inflammation of the urethra
ジムベルシの病院: At Jim Belushi's hospital
不思議な扉の文字は『空耳ケーキ』 : The letter on the mysterious door says 'mishearing cake'
GOODBYE SADNESS
もう泣かないで:Don't cry anymore
毎日ふわふわ:Everyday it's fluffy
...I feel like I'm missing something. Or perhaps reading too deeply into it because it's not supposed to make sense? Anybody else have a take on this?