Lymph node about collarbone - leftside

Hi, I am new to this forum, around 3 weeks ago my partner found a lump above his left collarbone, I googled it and it came up with horror stories about cancer. Everything I looked at said it was highly possible this is cancer.  Other than the lump he has no other symptoms. Last week he went to the doctors and they arranged a ultrasound for the next day, the results came back a couple of days later as inconclusive. Blood tests were taken today and he also received a letter saying the doctor had made a urgent cancer referral.  The lump has gone down a bit since the ultrasound.  We are so frightened, has anyone else had any similar experience and if so what was the outcome.

 

Thank you