I feel... off? I want to say emotionally drained or detached but I’m not sure.

I’ve had a lot going on lately. I’m constantly stressed, my mother recently got diagnosed with cancer and I live states away from her, I’m not where I want to be in life and that’s putting more stress on me, etc. Sigh. But it gets kinda weird... I’ve felt almost detached from everything? I visited my mother and that was wonderful, but when I got back I felt exhausted. That usual happiness I get when I see my dogs wasn’t there and it almost felt like they were strangers in a way. It feels like I’m forcing my love for them even though I know and do love them. Even talking to my best friend felt draining and I don’t know why. My sister said I was being really pessimistic lately but I thought I was being realistic. I STILL think I’m just being realistic. I don’t know what’s wrong with me.