First, you must ween off your child from breast milk as maximum duration for feeding is 1 year.
After reading your symptoms i feel you have sever chest infection
leading to congestion and cough
. I would suggest you to take strong antibiotics for the same along with a bronchodilator
, cough syrup and an anti allergic drug. You must visit your physician for the prescription for these drugs. Steam inhalation will also help your condition to improve.
Wish you a speedy recovery.