Breast cancer

Hi I got diagnosed with stage 2 breast cancer in aug 2019, I underwent a lumpectomy but had to have another operation because it had spread to my lymph nodes. I had radiotherapy which I finished in dec. what I am concerned about is this coronavirus I work in retail and work on shop floor customers coming quite near me which is a worry to me . I rang my doctor with my concerns and he says because I had my treatment in December I should be ok. But I haven't had the all clear yet I had appointment to see my consultant in April but now been put back till June with what's going on. I don't even know if am vulnerable because I never received a letter from nhs. Can anybody give me some advice please x