This is a simple case to demonstrate the Hahnemann method of essentials required in case taking. Its not complicated and I have stripped out much of the other symptoms that were presented to focus on the complaint.
Members of the IHM will use the Therapeutic pocket Book for analysis, but feel free to use any repertory you have.
You can answer in the comments section.
You have been exposed to colleagues at work who are coughing while in various stages of a flu outbreak. Within a few days, you start coughing. It is dry, non-productive, deep and hacking, worse in cold air, and talking. Coughing produces a very raw sore feeling in the chest, which is relieved by drinking sips of cold water. Coughing can be incessant in trying to bring up mucous from the chest, but expectoration is rare with any bits that come up only making it as far as being swallowed. On one occasion the coughing was so intense that a small amount of urine involuntarily escaped. What remedy would you think of first?
admin
Vera Resnick IHM DHom Med (Lic)
The Institute for Homoeopathic Medicine 
Cough, cold drinks, amel – Caust, Coc-c, Cupr, etc
Bladder, urination, involuntary, cough during – Caust, Puls, etc
Cough, deep enough, sensation as though he could not cough, to start mucous – Caust, etc
Throat, mucous, swallow, which must – Caust
The remedy is Causticum.