I agree with you unhappy. I have been with my DP for 16 years now, and the past three have been, well, awful - if i didn't love him so much i would have walked away, but i know we love each other and that makes it worth fighting for. And it is OK actually to say, that YOU need help, and actually i think you getting your confidence back will make a huge difference to your relationship. Not just in the way you stand up to DP (we all have to stand up to your partners so im not suggesting he is a bully) but the way he sees you.
My DP and I got together when i was a single parent, i guess he saw me as very independant. I also, went to university and got a degree and PhD when DD1 started school. So, what he fell in love with, was used to, was a strong independant woman who was always the life and soul of the party, very loud and in your face, happy go lucky girl. Due to several things, bereavement, PND and severe anxiety he now has a depressive, scared, aggressive, clingy, insecure wreck who every week thinks she is dying from one disease or another. He had to have time off work to look after me, we are in financial SHIT and its took its toll. My DP has gone from being laid back, easy going, do anything for anyone, never raising his voice person to a verbally abusive misery who i have to walk on eggshells around sometimes. BUT do you know what, i know that this is partly, if not mostly, due to the way i have become. He has told me he doesn't know what he is coming home to.
I have been on medication for over a year now and i think, i can see a tiny light at the end of the tunnel. Im looking for work (not before time!) and trying to take control of my life again. Much like you really.
I had counselling last year, it was a waste of time but i am now having counselling again, i had to fight to get this, which will be open ended until i feel i dont need it any more - im a long way from that, but it is helping.
If you have a look at moodgym, there is a section which describes really well the different types of therapy and there is an interactive section which might help you decide what is right for you. It is a bit "self helpy" and im a bit sceptical about that sort of thing but it is interesting anyway. Do have a look at it. It is non profit making, run by a university for research purposes.
I think you both would benefit from some counselling together at some point. I only wish my DP would come to a session with me, but he refuses, that is because he is scared. You don't have to make it about him, but it might be a way that you can express to him what you feel without him feeling like he is being attacked and reacting angrily.
Good luck - don't be fobbed off at the doctors with nothing, or just medicaiton, insist on counselling.