Husband has had "chemo fog" same as you describe.I knew to expect it so was not too concerned.It passed, then he had heightened sense of smell. Could smell food like for instance a cucumber from 20 feet away.That also passed. I now think his hearing is diminished although he says I speak too softly! The Tv is up a few decibles. I hope this too will pass. Got the tingling in his hands , Neuropothy. Sensitive to cold. Chemo is nasty stuff.
Always talk to the docs about side effects and read the literature that comes with the chemo drug.
Stay strong you will both get through it.
Jane