I Have Been Sick For A Couple Of Weeks Thinking

I have been sick for a couple of weeks thinking its a virus. stomach ache upset stomach. I feel like I have
throw up . I have no appetite. If I eat I get sick my stomach will burn harden up. after a week I made myself eat a wrap thinking that might make me feel better which made me even worse throwing up. I am tired no energy.
I work so I am forcing myself to go back to work but If I eat anything it makes my stomach hurt and feel nauseated.
any idea what is wrong with me could I have a ulcer?