Squamous cell metastised from base of tongue to lung

Hi, I had radical radiotherapy for scc base of tongue and neck lymphs 2 1/2 years ago.   Seemed to be cured.. all looking good.  Just had diagnosis of scc in both lungs and central lymphs.  Given cancer in both lungs, surgery is out; I am being led to believe that I can't have radiotherapy as i has it for my tongue cancer: and there only seems to be the old platinum cudgels left (cisplatin etc).

I would like to ask a couple of questions please?  1. Is it correct that I can't have radiotherapy for this following previous head and neck sessions (30 sessions) ending June 2022?   Also, are any other treatments recommended (ablation, cryo etc)?

I am trying to get my ducks in a row to know what my real options are.

Many thanks