1st appointment with haematology tomorrow. Feeling scared

Hi I've never posted anything on here before. In abit nervous as I've got my first haematology appointment tomorrow after seeing the doctor on monday(I don't know if it being this quick is a good or bad thing). I have  had several blood tests which have come back with my white blood cell count getting lower, night sweats and a small pea size lump behind my ear. The doctor explained that these symptoms added together was a red flag for leukaemia or lymphoma. I keep telling myself to be positive but to be honest im a little bit scared. Or Could i be worrying about nothing