YOU ARE NOT ALONE! You might be surprised at the number of people who suffer through anxiety. It can be overwhelming and discouraging. I know when I am stressed out and spread thin I have no time to decompress. With six kids and a job, you are no doubt spread thinner than many!
I found that when it all seemed to get to be too much, exercise helped me out more than you could imagine. It burned off some of the nervous energy, let me sleep a little better and therefor felt better the next day, and my body started to act more efficiently. If you can find time great, if you can't then MAKE it. It can be something as simple as walking briskly for 20 minutes at lunch time (I'd do it before I ate) and stretching when you first get up in the morning. What ever you can work in and however you do it, I found that it helps. That is just the beginning. It sounds like you have some great advice and if you need to go see someone to help you then please do it. I saw some suggestions from others that may help.
Be sure that you get help at home, too. It shouldn't all fall on you. Unless you had six kids at once, at least a few of them should be old enough to help you keep up the house. I love it when my eight year old step son is here because he does the dishes every night (and he is just awesome in every way), and tomorrow he is vacuuming for the first time. Little steps to get some things off of your plate really help.
If your anxiety is worse in the car, then try to allow yourself extra travel time when possible and look for alternate routes that give you a little more green than concrete. When we lived in Houston it took me between 45 minutes to two hours to get to and from work and it was just six miles away. That's crazy! I found that when I went on the smaller streets it took me about as much time but was much more pleasant. The stop and go there is absolutely teeth-grating!
If you need to blow off some steam or cry to a stranger-friend or anything, do not hesitate to contact me. I'm happy to talk to anyone who needs to talk to someone.
Take care and know that you are not alone. All us mamas are rooting for you!
S.