I went through something similar. During and after the treatment I had a lot of candida-like problems. I tried salt and whatnot.

Then I tried eating (live) yoghurt, that helped a day or so.
After a while I gurgled(!) with sauerkraut, that helped me! when I was able to chew and swallow I continued eating sauerkraut, which I believe did the trick.
Probably the Chemo had killed all good and bad gut bacteria, sauerkraut built good bacteria again. At least that is my theory. Mind you, it has to be proper sauerkraut, not made with vinegar or similar.