[後「あと」]で => After V1, V2 N5
Time
気味 => -like; -looking; -looked; tending to ~ N2
に気がつく => to notice; to realize N4
〜がさいご(が最後) => if you do... negative result N1
Decisive (resolute decision)
たが[最後「さいご」] => Once A occurs, B happens N1
Information, Report
気にもならない => it's no use; can't do N1
Evaluate
[気味「きみ」]だ => Like A, Looking like A (is happening) N2
Adjectival, Descriptions
一気に => in one go; without stopping; all at once; immediately; instantly; right away ~ N2
...ような気がする => have a feeling that; feels like; seems like; think that ~ N3
Description