@anndri3 it may slowly improve with time. Make sure to get enough protein and try to increase physical activity as you are able. Gradual changes add up over time. Maybe consult a nutritionist and get referrals for OT and/or PT. I would consume bottles of Premier Protein— low sugar and 30 gr of protein. Also stay hydrated— appointment eating and drinking so you don’t just fade away. I slept and napped most of the time during radiation and a few months afterwards.
Take good care. My surgeons would ask how I felt and I would say, ‘I’m not dead yet.’ They didn’t know how to take it but it was true for me at the time. A year and a half later things have improved.