Please go to the doctor. Those are symptoms not to take lightly.
I know how hard it is to go to a physican, but sometimes we have tto just do it.
My daughter gets a lump in the same place you described when ever she is ill. Her Dr. said it is just a swollen lymph node and it can take months to go away. If it is not getting larger it is probably going away.
When I was reading your concern it was quite surprising that I'm actually experiencing the same thing. My lump is in the same place but started out in size the circumference of a nickel. I noticed it about 1 month ago,it didn't really bother me to begin with. But now I get a really dry throat at work, that catches me off guard and drink litres of water at a time now just to get it to pass. Almost like a bronchitis type coughing.
Now, in the last two days I've noticed it has grown a little, now to the size of a quarter. THis time though, it is very painful to the touch and now the right side of my neck running up towards the nape is very stiff and sore. I can barely turn my head without me feeling some pain. I have now booked an appt with my doctor to get it checked out. If I find out what it is I will let you know. But I would recommend you to get it checked out just in case before it may get worse like me.