Need help can anyone tell me what's up with me?

Last night i started to get a cough. I didn't sleep much last night as i only got about 5 hours sleep from feeling sick, coughing etc. This morning i felt worse. I have a headache, feel sick (have not vomited though), every time i cough a lot of phlegm comes up and feel light-headed. Can anyone tell me what might be up with me or how i can treat this? Thankyou.