"most of us including myself have only heard of it for the first time in the last week "
is there any mistakes in this sentence ?
and sorry of any mistake because english is not my mother tongue
Most of us only heard about it last week.
"Myself included" is probably redundant given the context, and "for the first time" is also implied. You wouldn't have "only heard about it last week" if it was your second time hearing about it, for example.