Hi I Had A Coughing Fit A Couple Of Years

Hi I had a coughing fit a couple of years ago when what felt like a brick hitting me in the head knocking me to the floor.it was the most intense headache I've ever had.stupidly I left it for 3 days before seeing my gp.he sent me straight to hospital for scans and a lumber puncture.they found nothing and discharged me without any explanation on what happened to me. Did i have a small aneurysm? Or something not so bad? I am getting headaches more frequently now since that incident And im getting quite concerned.my doc seems to fob me off all the time so I wanted some other advice. Please and thanks in advance
martin