My son has been having these cough spells for over a week now. Took him to his drs yesterday she…

My son has been having these cough spells for over a week now. Took him to his drs yesterday she says everything looked good and that it was probably allergies, post nasal drip or cause he's teething. Well he's been randomly throwing up too now for about a month like once a week or so. And today he threw up and then coughed for awhile after. And I gave him his night time bottle and now he's been coughing for like an hour. I'm doing everything I've been told I can do and it's not working. He doesn't want honey water, doesn't want juice fought me on it. So now I'm just hoping he falls asleep me holding him. I feel awful for him and I'm calling them tomorrow to say it's gotten worse. And he's going to his fathers Friday so I'm going to really worry about him :/