I’ve had swollen lymph nodes on the back of my neck, vomiting, and fever?

I am an 19 year old male. About a month ago I was sick throwing up and a fever for about a week & I lost about 10 lbs. I’m feeling good now, I went and got blood work done two weeks ago and my cholesterol and liver enzymes are high, and for the past week I’ve had swollen lymph nodes on the back of my neck. They don’t hurt or anything but in not sure what’s going on. Is it HIV, or cancer or something?