What's wrong with me? I have no idea what is going on.. I have this weird cough and I keep feeling…

What's wrong with me? I have no idea what is going on.. I have this weird cough and I keep feeling the need to cough and gag and I am not throwing up. I just keep coughing and gagging. I have been doing this all night. I haven't even got to sleep yet!! What is wrong with me? Maybe I am sick? Has anyone had something like this before, or am I crazy, lol?