Please be gentle on yourself. Certain dates can be harder than others, especially when infidelity-related dates mix with holidays, birthdays, dates of a loved one's death. A whole gamut of rough and raw emotions can happen, especially in the days leading up to a rough date.
If you can, try to find something beautiful and comforting about the day tomorrow, and cling to that.
We're here for you if you need to talk more. Hang in there. You have our support.