Had bronchitis, took antibiotics STILL COUGHING!!!! help?

It is normal, and you do not need to go back to the doctor about it. I say that because you say you are only coughing up a bit of clear mucus, if anything. Your lungs are healing. They will continue to heal. You did the right thing by finishing the antibiotic. Let your lungs finish their part. Drink plenty of fluids, unless you have another health condition which would preclude that...and eat real meals, full of good quality protein. And don't forget vitamin C. Good luck.