Nauseated, Hot And Weak...whats Wrong?

For the past few days i have been feeling nauseated, hot and weak. i'm not pregnant so i dont' know what this could be. I started taking a new birth control the past few days but this morning i started feeling sick before i took the pill so i'm not sure thats the reason for the way i'm feeling. For the past few days i have been getting nauseated, hot and weak in the morning time. Usually sometime after 8am. I eat eggs and have coffee in the morning and then the sickness comes sometime after that. I has been lasting for most of the day and the smell of foods make me want to throw up so needless to say after breakfast not much else has been going into my body. The most i can handle is fruit. The nauseated feeling is in the top of my tummy and in my throat i feel like there is a ball of something. Sunday when i had this feeling, it lasted until about 6pm and then i was able to finally eat something small for dinner. What could this be? Should i try taking pepto or something for it? What worries me the most is the hotness and weak feelings i'm getting with the nausea.