Gosh, it's a rock'n roll ride isn't it!
I didn't have tinnitus, but I did have chemo cancelled so can appreciate something of what you may be feeling.
I was only ever scheduled for 5 chemo sessions, and asked questions about this because I had seen that lots of people were put down for 6. My Consultant explained that there is a high drop out rate due to the side effects, and only a relatively few people tolerated all six chemo sessions safely. The most important thing was to have all chemo sessions within the timeline of the course of radiotherapy, and to have the radiotherapy within a certain number of hours of the completion of the chemotherapy on that day to optimise the treatment impact.
As it happened, I had two chemo sessions and then developed flu in week three (confirmed diagnosis) with my temperature routinely above 40. (Fun times!) They cancelled my 3rd & 4th week chemo, but continued the daily radiotherapy under infection control precautions because, they said, the radiotherapy is the most important thing, and the chemotherapy is 'the cherry on the top'. (My Consultant's exact words.)
Once they were happy that I no longer had a fever and I had completed my antiviral treatment I had my 3rd & 4th chemo in week 5 & 6 of my radiotherapy. I was was worried and upset that I hadn't had all 5 chemo doses or that they'd built up some kind of 'cancer crushing momentum' and felt as if I'd failed somehow, despite doing all the preparation, avoiding crowds & obviously sick visitors as advised. I had para aortal node involvement and obviously I wanted every possible rogue cancer cell mopped up. It wasn't easy to get my head around my feelings of the 'what ifs' at that point.
Then I had my 5 week/pre brachytherapy scan results. I had well over 50% shrinkage in all sites. My cervix, the pelvic lymph nodes on my left hand side that had become so big they had seriously affected my walking, and the para aortic nodes. I had 6 more radiotherapy sessions and 1 more chemo to go. My team were delighted with the result - even more than me actually! Apparently, current research indicates the most tolerated number of treatments averaged is 3 anyway, so you are already rocking it with one over. Let the Brachytherapy work it's magic, and then be patient for the ongoing treatment effect to do it's bit when you've long since recovered from the daily hospital visits.
Anyway, I had 2 chemo then a two week gap and then 2 more chemo, and my first post treatment (3 month) scan in April 2017. It was clear or as they described it 'a complete result'. Of course, my lymph node involvement means there's no room for complacency. and the next two years will inevitably be important, but I'm currently well and I've moved on from worrying about the chemo that never happened, to enjoying life and taking each moment as it comes. Which, I'm sure, is the point you'll be at very soon now. :)