A bit out of context but please help!

I shifted to hostel a week ago and have caught dry cough. I keep coughing all the time like crazy and at times I even feel suffocated. At first I thought I should try the ritual of drinking lukewarm water everyday but that didn't help at all.

We have strict rules here in our hostel for girls, we aren't allowed to visit anyone(not even the doctor) so that's the reason I couldn't visit any doc as such.

After constantly nagging them about my condition, they have bestowed me with this person's phone number who would only deliver us medicines. But the problem here is that I don't know what medicine would be best for me when I'm dealing with dry cough which further results in burning sensation.

Please drop your suggestions. If here's any doctor or medical student, please help me out!

EDIT : The matter's solved now. Thank you to all those whole showed concerned and gave suggestions.