Can a person just get used to depression and stop noticing it ?

My life has been so crappy for the last seven years. After my husband had his kidney removed and then half his thyroid and then fell down in the hospital breaking his hip and going through rehab I’ve had crazy ups and downs. I am happy he’s in no pain but our lives are television, naps and eating. That’s it. If I think about it I feel depressed but when I try not to I just feel “blah.” I don’t remember what joy or happiness feels like. I hope I get to feel it again someday. This morning I had a brief dream: an old, very large black car pulled up with a sign on the side. I couldn’t read it so I approached the car and it read, “Suicide.” I’m not nor have I been suicidal but what a terrible dream! The depression I had for a few years is gone. Could I just be used to this feeling? That is, could I be depressed and not even know it? I could join a yoga class but for some reason I don’t feel like it . Not sure I could handle being around smiling, laughing women.