Hi @Nique - I am so sorry you've had such a hard time of it xx Sometimes the Immunotherapy can have really bad side effects :( I've heard of a few (non BC) that have had particularly bad issues with it - and know one personally :(
I hope you've recovered well from your surgery and the radiation - make sure you keep the lotions up for another few weeks, as it continues 'working' inside - you'll feel that the area is still warm to the touch, too.
If you want someone to chat with, ring our Helpline 1800 500 258 & I am sure they'd have a sympathetic ear to your plight xx
take care & all the best xx