I'm so sorry that your husband is suffering with dizziness, it's terrible. I had posted on 11/5/23 "Vertigo and Folfirinox" because my husband was having vertigo attacks and then dizziness spells during his chemo treatments and I was wondering if anyone else had experienced that. What we did find out was that he was extremely deficient in vitamin D, which the physical therapist had thought might be the culprit.
He completed his 12 rounds of treatment at the end of February and is working on getting his vitamin D level back up. Maybe you could look into that to see if that might be the issue? Please feel free to reach out if I/we can be of any help. I hope he gets some relief soon.