I'm sorry about that and I can completely understand what you're going through, I went through the same thing with my daughter and it took me a while to accept it and to get over it. You need a very good support network around you, I hope that your husband is very supportive.....just remember you have beautiful children and you need to be strong for them. They love you and need you!
I had a lack of support from my in-laws and my husband worked alot and all my family live in Australia, I was alone most of the time and just got negative comments from my in-laws about raising children, breastfeeding, I was really alone and isolated. Try to meet as many positive people around you or join a group with other mothers so you can have more social contact, that also played a major role in my PPD. If you need to chat just let me know xoxo
I'm so sorry you're going through this, but you did a great thing by talking to your doctor! I believe I had it with my son - didn't develop immediately but gradually crept up on me. I was also extremely anxious. I wish I had gotten help sooner than I did! Hope the meds and therapy kick in quickly!