Just diagnose to have a liver cancer

Two weeks ago, I was still happy preparing my holiday to Singapore. Last week, I was told that I have a 7.8  cm tumour in my liver. Underwent a blood test and ct scan. Now waiting for an appointment to see oncologist. 

Knowing liver cancer is not a common disease in UK, I am very worried and feel very stress about no knowing the outcome soon. Can someone advise me on what should I do now?

is there any advice on what kind of food I should eat n avoid to add more burden to my liver?