Please help with advice, support and well anything to stop the heartbreak :(

Hello, I can on this site as I am looking for support for myself, my mum but mainly for my Dad. For the past few weeks he was complaint about his leg 'feeling funny' and often shaking and/or he would lose balance therefore making him stumble and sometimes fall over. A few year as ago he trapped a nerve there and just thought it was a repeat of that. My Dad is one of those people that will only ever go to the Doctors if his head was hanging off. I kept telling him to make an appointment and so he promised me he would the following week. Anyway on Sunday night, he sat down and his leg started to shake really violently and then his whole body started to shake. He slumped forward in his chair and ended up on the floor. I had phoned an ambulance in the midst of this. The ambulance crew did all the regular checks (heart, blood pressure, temperature etc) and it all came back fine and normal. After being to he was a 'mystery' they decided to take him to the hospital anyway as he did have a sort of seizure so they needed to keep an eye on him. After waiting hours in the hospital and a few other doctors checking him over, they decided to keep him in for a brain scan. So, he calls me and my mum at home and tells us that they have found a mass on his brain and that further full body scans need to be done. After waiting 3 days for this to actually happen, we are then told that he also had a mass on his lung, and they believe that the lung tumour will have caused the brain one. As you can imagine, our world was completely turned upside down. My dad has always been heathy, you know the sort - goes for long walks, active in his job, travels a lot for his job etc. So this is so out of the blue. I can't even begin to imagine how he is feeling, but seeing him cry is horrible. I have probably only ever seen him cry twice in my entire life. He is at home now, all he has been told is to take the steroids and other tablets he was given and that a team of neurosurgeons will look over the results next week and then ask him to come in for a biopsy and a discussion about treatments and how and if they will be used. I know I should read stuff up on the internet but I have looked at websites such as the NHS and Cancer Research and it says that for a patient who has had a cancer spread from one organ to the brain means that the survival chance is very poor and about 4-6 months. I am here cos I just need some help, advice, anything. I personally don't know how to think, feel, stop crying and maybe talking to someone who has had the same thing or knows other who have would help so, so much. Thank you. Leanne