I can understand how you're feeling. A lot of times I think our mental illnesses do a really good job of making us feel like we're alone in our suffering, even if we're not. For a long time I thought that no one cared about me, that I had no one to talk to or who would be there for me. But when I was admitted to the hospital I realized there are a lot of people who understand, and there are even more people who I can talk to and who honestly care about me.
Don't let your mental illness overtake what you know is right. I bet that your husband loves you, and that he's always there for you. It's probably only your illness that is making you feel differently. If you had no mental illness, would you really feel the same way?
You're never alone, no matter how alone you feel. There will always be people who care about you and are there to support you. Look around and try to see through your mental illness; I guarantee you'll find them.