@nmrobbo
I had a different and longer course of treatment, but it’s not at all unusual for an emotional response to cancer to surprise you when reactions catch up. Seeing a psychologist is a good idea. It’s also quite likely that a brush with a potentially lethal
disease can stimulate any old, unresolved emotional baggage. Your world has changed, your certainties about what life offers and will bring may have changed too and all without any say-so or consultation. Anger is a perfectly understandable reaction.
But it’s not a helpful one - it can feed on itself, rarely provides helpful insights or ways forward. I didn’t experience such an intense reaction but I went through a period of confusion about who I now was and could be - a really good counsellor helped me find my way through and, more than a decade later and after a short period of treatment, her methods are still useful. The mind and emotions get affected by this stuff too, not just the body. Persevere, be kind to yourself and you can find your future path. Best wishes.