Feel so sad :(

Well to start just after new year 2015 my dad found out he has cancer on his tonsil its a big tumour and it's spread to his glands and back of his tongue :( I love my dad to bits and I hate seeing him in so much pain :(
He has to go through extensive radiotherapy and chemo for 6 weeks and if that doesn't work have an op which means he may not be able to talk again and will be very disfigured in his face :(. I know I need to be strong for him but I am so scared right now don't know what I would do without him :(