Pandemonium.Scrumpet said:
My mother required round-the-clock care; I took the “night shift” to have some time alone with my mother after long school days.
Repetition; maybe use a pronoun.
Pandemonium.Scrumpet said:
I will never be able to apply the hours I have spent carelessly, on another cause
This part is a little ambiguous. Do you mean that you spent hours carelessly on another cause ? Or that you carelessly spent hours that cannot now be applied to another cause ? In any case, the comma after "carelessly" is agrammatical.
Pandemonium.Scrumpet said:
...and my future patients– many who have not yet been born–
In general, there should be a space on either side of any dash you use to set aside an idea from the rest of your sentence. Also, "many who have not yet been born" should be "many of whom have not yet been born."
Pandemonium.Scrumpet said:
“tried”.
The period goes inside of the quotation marks.