Honestly, am I just wallowing in self-pitty?

I think it's normal. Everybody wants to feel loved and when someone forgets about you on a special day it makes you feel unwanted or forgotten. I know the feeling. The first mothers day I had as a new mom was just like this. Everyone forgot about me. Everyone I knew was aware that I was so miserable because my 3 month old cried all day every day non-stop because she had colic. When I told my sister that I had a terrible mothers day she said "I forgot you were even a mother!" It made me feel like she didn't even care about me any day. I cried for like two hours straight. So yeah I get that way too. Especially if you have other stressful things going on it makes it worse.