HELP! ive been coughing up phlegm the last month or so and it wont go away, also when i take deep breathes...?

When you've had a bad cold, the cough is the last thing to go away. I've had coughs last over a month, sometimes longer. Having a bad cough with a fever would be concerning, but if there is no fever, you are probably just on the mend, but very slowly. If you need something to help it, call your doc for a prescription cough med.