I have 26 years old

Patient: Helloi have 26 years oldyesterday i took 3 times bicarbonate of soda and today i feel too bad.I feel my hearth beat fast and i have difficulty in breathing.i went to Dr and they gave me a medicine called propranolol.But still i continue feeling too bad.I would like to know what i should in this case

Symptoms: Pain on chest, difficulty to breathe, heart beat faster.