Lymph nodes in groin and left collarbone

I think im worried for nothing but need stories to calm me down or indeed validate my anxiety

Ive had hard fixed groin lymph nodes for approx 2 years, I can only feel one but when scanned there is multiple. The biggest being nearly 2 cm. They advised they think theyre not sinister 

Then I went to ENT with hearing loss to find my adenoids are enlarged (apparently rare in adults) which i have steriods to try and shrink.

Pre my ENT app i found a pea sized hard fixed lump on left side neck just above collarbone, I told the ent consultant who referred me to get it ultrasounded which said it is a lymph node measuring 2mm x 3mm so yes tiny buts its still very much there

Can all 3 areas be enlarged, hard fixed and there is nothing to it ?