I felt incredibly sad at one time. Couldn't sleep, was always tired, cried a lot. It was depression and I didn't even know it. My husband called my doctor. He knew something was horribly wrong.
I had taken care of my father for 3 months faced a lot of things had a 16yo daughter (you know what that is like!!!) etc. Too much on my plate. I became a zombie. Made it through the day - just barely.
One day poof, I just hated being sad. Looked at him and cried. He brought me to the dr. She said I was depressed. I wanted a magic pill, she said no, I needed some blood work to rule out anything else - physical. He brought me home and basically took over for a while. Made me walk with him every night to talk. Believe it or not, that was what I needed, his time, exercise and a break. It took the rest of the summer but I did manage to get over it. That was 9 years ago. I'll know next time if it ever returns. I was afraid it would but I'm more careful now and ask for his help when I'm overwhelmed.
Ask for help, someone will and you'll feel better.
take care
denise