I had a bad Mother's Day a couple years ago right after my grandmother and mother-in-law passed away. It was a horrible day that I just wanted to get over with.
You need to take a nice long hot bubble bath with some soft music (or absolute quiet, I know how nice that is sometimes) and pamper yourself a little bit tonight. This is your special day even though things seem like a mess. Try to salvage what is left of your day.
I pray that everything works out well for you and your family.
BTW, what meds are you on? It was around my bad Mother's Day that I finally admitted that I needed an anti-depressant. I take Lexapro and it has done WONDERS for me! It does take some time and probably dosage changes to get to where you need to be. Hang in there!