I don't really know where to start with explaining things, but in January I started getting quite breathless even when doing nothing like laying in bed. In fact it was often worse when laid in bed. 
About 2 weeks ago I noticed a small lump in my neck. Now I'm a student nurse so I knew it was just a lymph node. I expected a sore throat in the following days, but I got nothing, passed it off and assumed my body took care of it before I had to deal with it. 
On Tuesday (so about 4 days ago) I felt a small lump whilst I was on a placement in a hospital. One of the nurses I was with got the doctor to have a feel and he'd asked if I'd had any illness recently but I hadn't. He suggested if it's still there after a week to book go see my GP and to take a list with me of anything that I've noticed recently even if it's completely unrelated. 
So I made this list, I get breathless often, I'm having night sweats fairly often (maybe 3/4 nights a week), I'm tired nearly all the time, and I've lost a stone and a half since mid November. But I kept telling myself maybe I was eating better or doing more exercise (I knew I wasn't) 

Anyway, today I'm having a little feel of my neck and the lump has gotten a tiny bit bigger and another small one has appeared just above and a small one further down my neck, so that's 3 in total. 
So now I'm getting quite panicky and was wondering if anyone has ever had a similar experience and it be completely normal bodily functions working away.