Modal verbs

Andrew: Hi Tommy How are you?
Tom: I`m fine even my mother tells me that I`m getting weight everyday.
Andrew: Maybe she`s right I really see you fatter
Tom: Oh my God. I know. Im eating and sleeping a lot. I love drink coke. I love watch TV everyweekend and I hate wake up early.
Andrew: You should change your habits. You should exercise everyday, eat healthy and drink a lot of water.
Tom: Thank you for your advices. I also have had headache but I hat e go to the doctor.
Andrew: You must go on a diet and you must go to the doctor.