Feeling down and like life isn’t worth it anymore

I have a history of anxiety and depression which have both been much worse in the last two years since my daughter has been born. I have constant panic attacks and I feel sad all the time. I’ve taken medicine and gone to therapy in the past but it never really helps much. I know I have to go on for my daughter but I don’t know how much longer I can cope with feeling this way. My husband doesn’t understand either and thinks this all is in my head. Has anyone felt this way and did it get better?