Hi S. -
I know I'll be there myself someday and I've wondered how I'll handle it when my time comes. However, I do know about grieving (my father died nearly 5 years ago and I'm still not over it because my daughter was a toddler at the time and I couldn't afford to dive in the way I needed to). I think I can share a bit of advise that may help you. I am a firm believer in honoring powerful emotions. Men who are busy with their careers see it as a luxury and an indulgence; but it's really very important to fully embrace what you're going through. If you don't have to force yourself to go out and do things, don't. That said, I don't mean wallowing and not taking care of your health, your home, etc.
I just became aware of a book by a wonderful psychotherapist and author named Miriam Greenspan, "Healing through the Dark Emotions: The Wisdom of Grief, Fear, and Despair." I'm not actually reading the book yet; I'm reading an interview with her in the January issue of "The Sun" magazine. Perhaps your library would have it, or you may even be able to access it online.
But in a nutshell, she believes (as do I, and I feel so validated) that unless one allows oneself to go into their grieving, they will become depressed and thus prolong their suffering. I'm going to take a little risk and quote part of the article: " ... there are certain experiences that slam us with emotion. ... We need to learn how to tolerate the emotions that accompany such experiences. We can't - nor should we try to - simply eliminate these feelings, because this will just entrench them further."
In my case, though I'm functioning, I look around my home and know that had I been able to go into and through my feelings of grief, I wouldn't have become so depressed and left so much unattended. Now I have messes that are hidden away that I don't have time to clean up, because life is so full and busy. I believe the same thing happens inside, so we cannot afford to ignore our feelings.
You are going through an enormous life change. You can't possibly know what you'd like to do with yourself now because you aren't completely the person you were before you became a stay at home mom. You are that person, but so much more (just some of the purpose of that is out right now). If you relax into it, breathe into it, and most of all be gentle with yourself, you can trust that it won't last forever. You say it's already been a few months, but my guess is that you've been giving yourself a hard time for feeling and behaving the way you have. Sleeping a lot is a sign of depression, and depression is a sign of denial of feelings. Depression isn't sadness, it's numbness, caused by that denial.
Another thing I suggest -- you don't say if you've sought therapy, but I'm a big believer in that as well. I went through some miscarriages several years ago, and I searched for a therapist would be at least an MFCC as well as a hypnotherapist. I found someone whose practice has a strong spiritual base and I was helped tremendously.
I think just writing your letter to MamaSource was a big step and I applaud you. I wish you all the best and I hope you felt better just by having done that, and even better by reading all the loving responses you'll no doubt be receiving. I hope my input is helpful.
Peace and blessings,
Colleen