hello everyone I am new on here been very worried 

I have been suffering with swollen lyth nodes in my neck and 3 weeks ago I had sudden pain from my ear down my neck to my shoulder and become very swollen on one side of my neck witch I thought was mumps but wasn’t that when I contacted the GP and said to keep an eye on it selling had gone down but now both sides of my neck my lyth nodes are swollen and hard to swollow and hasn’t gone away I have been suffering for months with joint pain and tiredness witch they have put down to possible fibro but my body is telling me there is something wrong just wanted to hear some of your opinions of what I should do ...