Extremely depressed

I am unhappy with my husband and I am contemplating divorce. We are extremely incompatipatle at this time in our lives. Now that the pressure about have children is strong, the depression worsens. I can't picture myself being tied down to him for the rest of myself.
I've loss weight from loss of appetite and I don't sleep much anymore because I am so restless at night because of all of the thoughts running through my head.
I need advice on what to do. I am ashamed about my thoughts about divorce because I always told myself that I would never get one but now I am battling with myself about it.
Does this sound like I'm at an unhealthy state with myself and I need to get out? I also don't want to drag him down with the way I feel.