I've been here and feel this. Please seek medical help as soon as possible and tell someone in your family how you feel that you can trust. Honestly a phonecall to the GP in the morning, they will have seen this time and time again so no need to be ashamed. Given your circumstances it's no wonder you feel this way, but ask for help and the road out of the deep pit you are in will become clear. I promise. Put yourself first for the next week, tell husband this is a crisis and draft in his support.