@basal: I'm glad to hear you're nearing the end of your treament. Several years ago I underwent radiation for a skin cancer on my face although I honestly can't recall if it was Gentle Cure and what, if any, my side effects were. However, since radiation does affect cells that require energy to rebuild cells this often does result in a general feeling of fatigue that even rest doesn't help to mitigate. Your body is in essence working overtime to restore healthy cells - and that can feel exhausting while it's occuring. Give yourself time - even up to a few weeks following completion - to start to feel like your baseline self. It's usually a gradual process.

Can you check back in mid-September or so with an update?