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.
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.
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.