David Bar-Magen,
Amein, and thanks for the good wishes. The one I was referring to was Parshas VaYeitzei ???”?. There are two of them, it’s the second one; the title starts with the words “Chizuk Gadol…”
Also take a look at some of the other sichos there on bitachon. There’s one in Vayigash, and a shorter one in Toldos I think.
All the best