Sad, confused, calm?

I struggled with PPD after I gave birth to my youngest child (soon to be 3 years old in May) I was prescribed Zoloft for a few months and then had to go off it due to losing health insurance. I have been telling myself for months that I need to get a GP and be put back on it. I have a lot of times that I just feel sad, lonely, anxious, and just want to go in a dark corner and cry. I work a full time(high stress) job and my other half is usually gone at his job mon-friday. I am thankful to have my mom as support. But I just can't bare to tell anyone how I've been feeling. I don't want anyone to worry about me.. I have two wonderful kids that I love with everything in me. I shouldn't feel sad.. I have/live a wonderful life. I know that I shouldn't feel the way I do. I just can't help it. I'm not sure if I am looking for advice or support. I guess more than anything I needed to vent.