originally published April 14, 2014
There are two very important links by Rabbi Doniel Neustadt that you may find of great value.
Link #1 - Sefiras Ha-Omer: Forgetting To Count One Day
Link #2 Counting Sefiras Ha-Omer Unintentionally
Lz"n Areyh Isser Ben Tzvi Hirsch Z"L