@TopOfTheCliff
Yes! I had Cap, 4 out of 6 cycles and then Covid made it higher risk for me getting to the plague pit of a hospital for blood tests than giving up the last 2. Btw, I tried for weeks to get hospital to accept GP blood tests. GP more than willing, but no. Grand Canyon of a gulf between primary and secondary IT systems. But, hopefully, they've found a way round it by now.
Mine was 'belt and braces' after colon cancer op. Was told that it was much less brutal than other forms of chemo, wouldn't lose my hair. Nothing about diet. But I was still adjusting to only having half a colon, so already cautious about beans, skins, pips etc. Avoiding al dente stalks of brassicas.
My experience was that it was a slow-burner. It held up the recovery from surgery in terms of energy and stamina, but that would have happened any way with being on the shielding list and not being allowed to leave the house.
3 years later, I still have a bit of neuropathy in my fingertips and I think it may have affected the small hairs in my ears. At least, that's one of the possible reasons for 2 major attacks of acute vertigo, 3 years apart. (I wake up, the room goes round and I want to die. Have to crawl to the bathroom. Lasts about 24 hrs. Next day, wiped out but back to vertical again. Stemetil helps a bit if I can take it soon enough. But dehydration may be a more significant factor. No day to day dizziness or unsteadiness on feet.)
Any side effects don't suddenly stop when you stop the pills. May even get worse for a week or so. Cumulative. You don't get get good weeks and bad weeks. Just v gradually get less Tiggerish, I guess, in your case!
Big caveat, of course. I don 't know how much the advantage of your being 20 years younger than me is cancelled out by 2 cancers and associated chemo. Different cancer, possibly different dosage.
But, all in all, my instinct says, please don't sit around waiting to feel ill! There's a v good chance that you won't experience anything dramatic. Just carry on normally, bearing in mind that this means normal for a normal person. It's not the time try to break records or sail uncharted seas. Save that for later!