I am so sorry you girls are feeling so low. Depression is a very difficult illness to live with. I have suffered with depression on and off since I was 12 years old and I am 33 now. I came out of a long and severe depression about 18 months ago and I can tell you I never thought back then that I would ever feel good again - but I really do!
One of the biggest differences for me is that I have discovered that I have IR (Insulin Resistance) and I have therefore been low-carbing for the last 4 and half months. I have never felt better. I can see how my IR and Hypoglycaemia (low blood sugar attacks) affected my mental state so much. I used to comfort eat when I felt depressed and it was always high carb foods or sweets (candy) that I headed for. My PMS seemed to start the day after my period finished, until the next one arrived! Now I have times when I get my period with no 'warning' signs and I have to calculate my dates, as I assume it's early. It's usually pretty much bang on time - I just forget how long it's been since the last one, as I have minimal PMS symptoms these days! If you don't know if you are IR, I would recommend getting checked out, as this could be a factor and it can be fairly easily addressed with an eating plan.
I cannot give you much advice but I can offer my empathy. I do know what it's like and it's a horrible thing to go through. I wish you weren't going through it. All I know is that with support from friends, family and a good Dr/Therapist you can and will get better in time. Be honest with people who are close to you about how you are feeling - you don't have to be alone with this. Most of the people who love you will try their best to understand and help you through this. The worse thing you can do is dwell on all your bad thoughts all on your own. Depression can distort reality, making you feel paranoid and sometimes some of the drugs px'd for depression can make other symptoms appear like irrational anxiety. Find a good friend who you can confide in about how you are feeling - someone who will offer sensible suppport and advice and not be judgmental towards you. Sometimes just having a cuddle with someone you trust and not having to explain yourself can make a big difference.
When I felt my depression beginning to lift, I made sure that every few days I would plan to do something simple that I enjoyed, like taking a short drive out to the countryside to see the newborn lambs and calves. Or going to the coast to just sit and stare at the breathtaking view in front of me. Just listening to the waves and the smell of the salty air made me feel happy to be alive. Then I would pick up something tangible to remind me of that good feeling - like a pretty shaped pebble or some shells etc. Then when I felt down again, I would hold my 'treasure' and remember my lovely day out and know that I would feel good like that again soon.
I hope this helps a little. Please feel free to PM me anytime if you want any support.
Nikki x
My Pdoc just DOES NOT understand me... 
I went to him yesterday for a med-checkup and told him that I had been having a lot of my old depression/anxiety symptoms show back up. I told him I felt like somedays I wanted to just walk away from everything and that I felt like I was slipping back into my depression. I told him how I was SOO rejection sensitive and that I was having anger outbursts daily - (broke 2 movies one day over something stupid). SO what does he do? He starts talking about some random thing that he did while in med school that I don't even remember what it was about now... and then while he was finishing up his "story" , he wrote my refill prescription for Zoloft and Wellbutrin and said "okay... have a great summer" I just walked out and got in my car and then slammed my hands against the steering wheel. 
i know just how u feel 
