So sorry sb, this is the last thing you need now, i have no experience of lumps but did have to have a suspicious mole removed from my neck, which turned out to be benign so can empathise with you.
I remember vividly my legs turning to jelly when i went to the hosp thinking they would send me away saying it was nothing and when that did not happen i too felt sick
The thing that helped me through was accepting that it was a difficult time and to give myself a break, once this happened i sort of just got on with it.
You are amazing, i greatly admire your strength and you CAN deal with this and if you need any moral support just email me, if you have messenger then we can chat on that if you like.