Any idea what i could be sick with?

last wednesday i had a flu shot...the next day thursday i started feeling a little dizzy and stuffed up in my head but not my nose.... by friday i was having a terrible headache, dizzy, tired, and was severely stuffed up in my nose and head...by saturday i had the terrible headache, dizzy, tired, stuffed in the nose and head, but now i was getting congested in the chest and developing an awful cough...come sunday i had all the systems but much worse...come monday the symptoms are just as worse if not even more so...i can't for more than 10 minutes because of coughing attacks...i am not really running a fever, and my appetite is fine...cough syrup and nasal spray helps a bit...oh, during this whole sickness my body has been very sore...my knees and my back and neck are in pain...my stomach and chest hurt from coughing so much as well...could i have gotten sick from the flu shot, or is that just a coincidence?...could this be the flu, or does it just sound like a severe cold?...any ideas how i can shake it?...should i see the doctor?...