I've felt like this before but just try to keep in mind that when it's a mutual decision between husband and wife in what's best for the family at that time, you do NOT need to feel guilty about it.
You are so accurate, I was working before but not now and had same feeling and specially when any one my friend got a job then I feel like I am not worth it lol then other side I love my kid and want to spend more time with him.