Yes, I do feel this way at times too. I am a SAHM who homeschool's 3 children and now have a newborn and 6 chickens and a cat. So my socialization is my children and my pets. My husband is gone A LOT too and I feel so lonely because we live in the country close to no one my age who doesn't work. I also lost a baby December '07. Winter time gives me the bla's. I've basically lost my identity of who I was before kids. We have our needs met but are tight on money too. But, my life is beautiful.
What keeps me from plunging into the deep is God's purpose and design for women. (By no means is this a bash to working moms and wives. They work hard and are often times unappreciated especially juggling the home and work.) But we were designed to be our husbands helpmeets, keepers of the home, and to raise Godly children. To be kind to others, meek and humble....and to put God first, others second and ourselves last. (When I realize that my wants are supposed to be last I am more at ease. It is hard not to focus on ourselves because we are selfish creatures. Despite what this world and most people think and say and will tell you about finding the "inner you" and focusing on yourself, we are supposed to put ourselves last.) There is more Scripture to tell you our purpose, but this is generalized. When I know I'm meeting His purpose, I am at peace because it is God whom we give glory too. No one else may see what we do in a day, or how lonely we may become....but God does.
There are other things He may have you do because I believe God gives us strengths in areas to fulfill HIS purpose to bring Himself glory. What are your strengths? Let Christ shine through you.
Also, my husband is VERY good about giving me good advice when I feel in the dumps. He always makes me feel better after I talk with him. He always finds nice things that I don't think about to say. Everyone has different crosses to bare. Some are heavier that others.
One more thing, some people will tell you to stay on the drugs or to get a higher dose. But I say get off the drugs and get a heavy dose of the Lord, because he will see you through anything.
This advice is contrary to most advice you'll get, but it is what helps me get through my days of monotony.
God bless you and yours.