Shocked newly diagnosed

i went to a & e on Saturday morning after getting back from Greece in Greece i had been feeling sick and on way back i had chest pains so I went to a & e thinking it was a heart attack they took bloods and the cancer markers were high so i had a chest x rays so to cut a long story short i was told have a referral for a camera down throat so I have been told I have cancer ik in shock but can they tell me this surely i need to see other special doctors?