Scared witless

Hi I'm new here, I've got Cushings disease (tumour on pituitary gland) had surgery 2 years ago see my endo every 6months I'm doing OK in regard to Cushings, I have a lump in back of neck, emailed gp who insisted I come for appt immediately, I'm not mobile I'm mainly bedbound, so I see him and he's like it could be head or neck cancer, I've lost substantial weight about 3stone in the past year, I have no appetite have uncontrollable sweating at night skin itching , the lump is about an 2cm according to gp, I'm really scared I've gone through having a rare illness and just want to know what people think it's 8days til I see Ent doctor which feel like forever.

Echo