@Magnolia Understandable if you did; I can't remember where so I could be mistaken, but I believe the author stated somewhere that, in the earliest drafts for this manga, Mameyama was supposed to be a guy, but it was changed before the first chapter was actually penned, though apparently, the character design didn't change much.
Considering this is listed as completed and there are no drama or tragedy tags, I'd like to believe that nothing bad is happening with the doctors and its naught but poor health due to staying up all night long.
Also, more Chibi is required. This chapter made me think of the My Roommate is a Cat, which seriously needs more chapters.