I keep saying negative things to myself during the day. My sister said this is not healthy. Can negative thoughts really hurt me?

In the morning, before I leave bed, I pick up my phone and look at my emails. It’s like I started my day on an escalator. I need advice.

I have a terrible habit of procrastination and it is affecting my job and my relationship with my girlfriend. Have some tips? -Jeffrey

My grandmother used to give me advice when I was sad or stressed. She told me to dance for a few minutes. What do you think? -Janice

I feel a little depressed and have heard about some kind of winter depression. What is it? -Steve