No, Debbie, you are not losing it. I think we all deal with this. I bet even Cave Mama felt unappreciated when Grog was off on a hunting party with the guys, she had to watch and protect the little ones, gather food (that was actually the majority of her family's nutrition), and sweep the cave.
Our society fills little girls' heads with stories of PRINCE CHARMING and happily-ever-after. We do not realistically teach or learn that MOST women will spend some, likely large, portion of their life alone. We are taught that alone is vulnerable, unhealthy, weird. This leaves single women, widows, and SAHM's having to learn to deal with a lack of support.
At least you have reached out across the Internet to women who understand and sympathize. There have been, and still exist on the planet today, societies where women have such restricted, unhappy lives.
I guess my "advice," then, is you are not alone. Make a list of all the GOOD things you have. A husband. Children. A home. Competence. Love.
Really, write it down. Hopefully, it can help put things in a little perspective. Then, maybe find another SAHM out there who is worse off than you and be a friend.
Thank you for being a wonderful human being, a loving mother, and a good person!
K.