'I think I need advice about what to do to lose weight. Must I keep to a diet? Must I go to the gym? Must I change work? Sometimes, it makes me depressed. I try to ignore it but it doesn't help. Can you advise me what to do? Can you help me?"

Nowadays, your problem is very common. Main reasons of excess weight are wrong diet and  sedentary life. I'd like to advise you to do more sport, esspecially running and proper nutrition. Of course, it's hard to find time for such things when you work almost every day, but I hope you'll reach your purpose!