My first thought is a tuna noodle casserole, since that might be the best way to please the picky eaters around here.
Here's one from Starkist Tuna.
Another one that is popular where I am from is Salmon Patties. Here's a recipe from Chicken of The Sea. (Which is a fun name for a company, if you think about it. )
In a pinch, if you don't feel like really cooking, I'm assuming that the fish sticks in the grocery will do just as well. Don't make it more difficult than it has to be. If you are dealing with sadness/ depression, even attempting to follow a recipe may feel overwhelming.