Hello, 

I had very similar symptoms last year and posted on here as I was concerned, I would definitely go to your GP and make them aware of your concerns and get them do have a look and take some blood. They did this for me as I had a large swolen lymph nodes in both sides of my neck, they fobbed me off a few times saying I was too young to worry about it I was 26. I had a friend who was 20 and had the same growth in the same place and he ended up being diagnosed with hodgkin's lymphoma (he had chemo and was cancer free less than a year after diagnosis) so I said this is why I was concerned and got a second opinion but it turns out luckily they where just raised from an infection I had a month before. One is still there now, they don't always go back down but I have had many tests done and all of them where clear.

There is a very high probability that it's nothing to worry about but I would certainly go to the GP and get some test done for peace of mind and god forbit it is anything serious you will have caught it early and it can be treated fast just like my friend, I read through all the swollen lymph node chats on here when I was concerned and a massive majority of them turned out to be nothing, there are a number of reasons they could be swolen,

Hope this helped mate and I wish you all the best