Swollen armpit and 2cm lump - freaking out

Hi, I'm not sure why I'm posting this other than to see if anyone else has had similar and a positive outcome? I noticed a visible swelling in my right armpit a week ago - it felt puffy. I went to the gp on Tuesday and the GP felt a 2cm lump deep inside on the axilla and has put me on the 2 week pathway. She said it felt smooth but fixed. My appointment at the breast clinic is in 6 days. Since my GP appointment, the lymph nodes on the right of my neck have also swollen. I have lost 3kg in 5 days (although I've been so frightened I've barely eaten so thats probably not surprising!) and just feel generally fatigued and 'off colour'. I'm on hrt and not had periods for ages. I've made the mistake of googling and the fear and anxiety is literally consuming me...I don't know how I can wait another 6 days! Thanks for reading x