What are good ways to gain weight?

I try to eat all the time but with my work scedual (1 - 9 am) its hard because I sleep when I get home. A brokenheart doesn't help with eating either but I try. And I do eat. I drink a protein shake everyday but I'm still losing weight. A month and a half ago I was 125 lbs. I'm now 109 lbs now and I can visibly see a difference in my body. It's getting bad. I need help.
What are good ways to gain weight?
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