please correct this sentence and help to write for me beautifully

[sitasma]

hey i had jet lagged, had school from next day and also of baby sickness(still have cough ) so i din't get chance to write you even short note. and also sorry for spoiling our plan(past).

[Ann1977]

hey i had jet lagged, had school from next day and also of baby sickness(still have cough ) so i din't get chance to write you even short note. and also sorry for spoiling our plan(past).

I'm sorry for spoiling our plans.
I had jet lag, I had to go to school the next day, and ( * ). I didn't even have a chance to write you a short note.

* I can't tell what this means:
also of baby sickness(still have cough )
I think "baby sickness" can't be what you had.