i think i have lymphoma

Hi i'm 19 years old and i've had a few swollen lymph nodes for almost 4 months they're all about the size of a pea or bean i've got 3 on the left and 1 on the right side they dint hurt and they're moveable i don't have any symptoms but i've heard you can have it with just swelling being your onky symptom i went to the doctors about a month ago and they weren't worried but she booked me a blood test for the 11th to settle my nerves but i'm just worried she gets it wrong i have bad anxiety and i'm scared about death so it's freaking me is there anyone who can give me some advice or any idea if i could have lymphoma is it something common or rare i really dint know ive always been so scared of getting cancer sorry to sound over the top i'm just really worried