Don't give up hope on getting a Class 1 medical. I had cancer three times in two years (mouth, lymph gland and spinal), am now in remission for three years and have a restricted Class 1 medical. It took 18 months from the last bout of the disease to get my licence back. The CAA was very helpful during my illness and had long discussions with my specialist about my treatments and ongoing prognosis.
Stay positive! I was told on numerous occasions that I would never get my licence back. Due to my sheer cussedness, I'm here now with a Class 1. Good luck in your endeavours