FIT test result at 400

Hey guys,

I'm really worried because I've had some changes to my bowel habits but I can't remember how long for. It's very smelly and only the loser side, I also have a chronic swollen lymph nodes that I've seen the Drs for multiple times over the last 2 years. 

Recently I got a FIT test and the results show blood in my stool with a reading of 400ug Hb/g and I'm so scared that it's cancer.

I'm on holiday and I'm going to book a GP appointment for when I get back but I'm so so scared. I need some reassurance.