I'm like this too. I am disgusted that I rarely brush my teeth. I will force myself to sometimes before leaving the house but I'm repulsed when I realize its even 2-3 days since I last brushed.
As for showering, I used to LOVE showering and washing my hair every day. I have a 3 year old and it still never stopped me when she was younger from showering every day. I one sat her in her high chair in front of the bathroom door with a toy while I showered. In the last year or two I really struggle with it and I only shower 2-3 times a week, and I feel disgusting. I sometimes use it as an excuse that its too hard to take a shower once my daughter is up so I don't bother, although this morning I forced myself to while she watched cartoons in my room.
I feel stressed out that I can't even brush my teeth and shower every day. I'm so disgusting.
Maybe that's why I shaved my head, it's easier with short hair. It's only about a half inch long.

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