I have a lot of pressure on my chest?

it started on thursday when the back of my throat was sore and then it was still sore on friday. yesterday i woke up with flem, a minor stuffy nose and toward the evening by throat became dry and sore and there was some dry coughing involved. last night before i went to bed i took some benadryl cold and sinus but that didn't seem to help as i woke up this morning with a real bad pain in my chest. it literally feels like i have cinder blocks on my chest and when i cough its even worse. the scary things is i had this about 2 months ago and it lasted for a few weeks.. what could this be? i have a doctors apt.. but its not until next week so i thought someone on here may be able to guide me a little bit.. thank you for your answers!