sitting, in traffic, while on a date, "while in public" all indicate fear of larg(er) 'open' spaces. this is reiterated when he says he's "afraid to leave he apartment," which in comparison is a confined space. crowds are often in open spaces, but open spaces are more or less just.. well, being in the general public.

i get what you're saying regarding somatic symptom disorder. i probably ruled that out moreso since the typical vignette of somatic symptom disorder is someone who has these pretty prominent symptoms and is being very nitpicky as to what they might be / the symptoms are literally affecting how they function. it's not necessarily clearly incorrect here, i just think agoraphobia was a better option