Whats wrong with me and how can i get better?

im feeling really ill last night i felt like i was going to throw up but after taking lots of deep breath and swallowing lots to try not to throw up at work when i got home i found i couldnt throw up despite feeling really sick so i went to sleep and felt better this morning but after eating i'm still hungry and feeling sick, feels like my food hasn't even gone down but i cant throw up, felt hot and cold at the same time yesterday but have been resting today and no temperature abnormalities, but havnt had a bowl moovement since i started feeling ill, help me if you can,