I am currently a SAHM and homeschool my 2 sons (ages 12 and 9) and find myself feeling like I am stuck in a "rut" sometimes, which makes me feel depressed. I also take care of my 92 year old Nanny (grandmother) and a disabled aunt. I often feel all I do goes unappreciated but I keep going...knowing that if I am not doing all I can for my family, I feel worthless and bad...sad I know.
Just remember that even though you may not be able to support your family financially, your role is far more important...you are the backbone of your family. And please know you are not alone in your feelings, I think at some point everyone has felt the way you do.
HUGS to you!