I'm so sorry you're having such a bad day.
Sometimes the hormones really make it a b!t...ummm, bitter thing to be a woman. But the good thing is...it will pass.
Don't give up on on making your son a hat. Maybe you could just wait until the blues pass. I know I personally find it difficult to learn anything when I'm feeling yucky.
I'm sure there are instructions on this website to make it easier for you to learn to knit in the round. I'm still a newbie or I'd try to help in a more practical manner. One of the more experienced members will probably chime in with some brilliant advice any time now. Until then, give yourself permission to feel cr@ppy for say...15 minutes...then go wallow in the love of your family for a couple of hours. By then, you'll probably be feeling tons better and will be ready to try again.
I'll be thinking of you and sending lots of