When should you worry about a swollen lymph node 

I found a pea sized lump on my collarbone right near my neck , it's moveable and not tender . The size of a pea. I went to my doctor who felt my neck and found more deeper in my neck that I cannot feel and do not move. 
 

Constantly feeling hot, then random shivers 

itchy skin 

Purpura rash 

weight loss over 6 weeks 

less of an appetite 

body feels like Iv done a workout at the gym and aches at slight things