I'm so glad you've fininshed treatments. I'm behind you by a couple of weeks and I think I'm on the same path with regards to lethargy and feeling beaten up.
This is the time to allow your recovery, so don't push yourself too much. I was told it'll be around the 2nd week post treatment when you'll start to feel an improvement in yourself.
With introduction of solid food, maybe start with smoothies and gradually thicken them up before moving to solids. It's certainly not a race but good to keep ypur swallow strong.
Your cycling and zest to keep going is grand and an inspiration, one that keeps me motivated.
Thank you so much for the updated. Big hugs to you.