Whilst My OH's daughter doesn't live with T1, she is almost 15yrs post a very aggressive head and neck cancer diagnosis and treatment. She is fit and well, and living her best life.
All I can say is, dig deep, go with the flow and manage your diabetes as best you can. Some of the treatments will play havoc, I feel certain, but you should receive priority treatment/support from your diabetes team through it all.
If you don't already, please investigate the Libre or other near-real-time blood sugar monitoring device which will keep you appraised of highs and very importantly lows.
Every best wish to you.