Hey, I've discovered lump under my right armpit few days ago. 
a bit of back story - I've started having issues on my right side around breast/ armpit and neck siince last summer. It all started with terrible itching under my armpit that was driving me crazy as well as my right breast feeling abnormal ( I know pregnancy can play big part) I was seen by nurse and she referred me to breast clinic which I missed because no one told me the date and I was away. They rebooked and by the time I got appointment we moved so I missed it again. By then itching settled and I felt better Fast forward two moths ago I started getting terrible aches on my right side, jaw, neck, back. and then fel swelling/lump on my right side of neck so I booked in appointment. ( this was back in March )Dr said it was fine but did full body mot bloods which came back fine ( still waiting on 2 more results). I was waiting for them two results to go back and see the dr to see why I'm having all this pain. Well my pain got worse to the point I'm awake at night and can't lie down on the right side. I have lump feeling in my back swallowing. And when I was checking that side was when I discovered that lump :/. I went to see gp yesterday they confirmed there's a lump but  told me to come back in 2 weeks to check. 
Im so worried I can't sleep