After I meet A, I always feel gloomy for a few days because she always complains about her work and family.
この場合、次のような言い方ができます。
ーAfter I meet A, I always feel gloomy for a few days because she always complains about her work and family.
「Aはいつも職場や家族の文句ばかり言うので、Aに会った後はいつも数日モヤモヤする」
after I meet A で「Aに会うと」
to feel gloomy for a few days「数日間モヤモヤする」
ご参考まで！
カナダ 
