How do you overcome severe fatigue and weakness after lung cancer treatment?

I was diagnosed with non-small cell lung cancer in August 2021 I had surgery November 2021 started chemo the end of the year seven hour treatments every three weeks for six cycles next CT clear next CT following had small nodule outside. My esophagus started chemo and radiation together for six more weeks then had clear CT. several months later discovered I had pseudomonas Colonized in my lungs. I had had it for 10 months struggling for my life before they realized what was going on. Went to a Special treatment center for five weeks antibiotics 24 seven through IV felt fantastic leaving the hospital by a miracle. Masuda motors was completely gone within a month. I was struggling again with low oxygen fatigue and weakness. So much that I don’t leave the house. I have been struggling with infections since I have been in remission for two years. I was recently diagnosed with pseudomonas which was treated with antibiotics after six weeks of finding the one that worked I do have COPD and I am struggling with life. I just cannot get my body up and going again. I am clear of cancer clear of infection, but yet my body does not want to move. It has been five years since the beginning two years in remission numerous infections. My question is has anyone experienced total fatigue weakness which caused lack of ambition to do anything and how do you get through it?