Worry wort

So my 6 month old daughter has the worst cough right now. I’ve been giving her medicine but it’s not helping. I’m worried! My husband keeps saying “it’s just a cough. Don’t worry” but my daughter is completely not herself. She doesn’t hardly wanna eat, and she chokes if she does and she’s been coughing and sneezing. She woke up at 4 am screaming horribly.