[farresito]

The first thing I always recommend: start doing physical activity. It doesn't need to be much; 30 minutes a day (start with less if needed). The difference is significant. Give it a try, please. Start tomorrow. Go out for a run for a bit. I have been (and still am) in the same position as you, although for different reasons, and sport makes a big difference. Wish you the best and be strong. Your daughters admire you and you will get out of this. It's easier said than done, but take my word.

[gukov]

Low testosterone and other related things can give a man depression. Way too many intelligent people are depressed. I think one of the major reasons is the lack of physical activity typically associated with engineering fields.