Hello I've Had A Cold For The Past 2 Months

hello I've had a cold for the past 2 months I have been taking probiotics and vitamins however I am not getting better.in the past week my body has been aching all over. last night I was unable to sleep and I woke up with back pain? chest pain? rib pain. It hurts when I breathe, sneeze, cough or move the wrong way. What could this be?