Was this delirium?

My partner was diagnosed with inoperable cancer back in April and I have been his caregiver up to this day 24/7. The therapy consisted of chemotherapy and radiation combined, totalling to seven weeks. He was also prescribed all sorts of medications, some to control the pain, some other for the nausea, other yet for his understandable anxiety. He is now one month post therapy and things are looking better, although we are waiting for the scans in September to confirm remission.

Towards the end of the therapy he started to experience some strange phenomenos