Back in 95 I was having a tough time, distracted and diagnosed as clinically depressed. A mild anti-depressant helped, but what also really healed me long-term was going to talk to a counselor. Depression is usually due to a chemical imbalance in the brain-- and it would be good for you to return to your doctor or the prescribing psychotherapist, if that's who you worked with-- but also to go and talk to someone. For me, the trick was realizing that I do have options (even small ones, including how am I going to make today work for me) and resources was beneficial.
In short-- taking the medication and doing the internal work really helped.
Oh, and tell your negative thoughts that they are NOT TRUE. I was really feeling awful at 30, I had just divorced, was beating myself up for a failed marriage, for choosing badly--- fortunately, I was in therapy at that time and ended up making many positive changes in my life. Now, at 43, I have a great husband (we've been together for 12 years) and an awesome kid, a better community of friends and feel very connected to them. Did you have someone in your earlier life feeding you negative thoughts about yourself? I did-- and I had to work through that stuff. You CAN do it. It is hard to unlearn those messages which contribute to one's negative self-talk, but consider this as an investment in a more fulfilled, happier *future self*. Not who you are now, but who you want to become. People are often very willing to go deep into debt for an education-- counseling is an investment opportunity that pays out a bounty of benefits over the long term, including more family harmony and feeling like a more effective and present parent. Good luck!