Third Trimester Depression

3 weeks ago at 32 weeks my doctor put me on a modified bedrest because I was contracting regularly and I was already 60% effaced. From that point I could not work or do housework I simply am able to sit back on the couch, take showers, make my meals then sit back down. This is excruciating for me. I have a history of depression that I try to brush under the rug but I can't deny. I'm the type to always stay busy. I don't watch tv, I don't sit around. I'm always working, cleaning, cooking, creating home improvement projects for myself because it makes me feel good like I have a sound purpose that can be measured. So now I feel lonely and purposeless. I can't provide an income, I can't clean my house or do my projects, I just sit. My husband works from 8-7 most days so I barely see him and I'm just alone unless someone visits which is maybe twice a week. 

My main fear is that once I have this baby I will have postpartum depression that is even deeper than what I am feeling now and that scares me.