What sort of illness do I have?

It started with a light cough two days ago then last night i felt really bad i was really cold I had an excruciating headache and felt dizzy and just kept on flinching uncontrollably and when i was sleeping i woke up at 3:17 and felt really hot. When I woke up this morning I had the same symptoms only with a blocked nose and kept on coughing up phlegm. Right now i feel fine only with a mild headache and my throat is a little sore. My symptoms just keep rapidly changing like last night i was ok then half an hour hour later i felt like crap. And two hours ago when i woke up i wanted to kill myself now im fine. It may just be a generic cold but im not totally sure if it is.