Dry Cough

I have been experiencing a severe dry cough now for about 3 weeks.  It is worse at night, usually involving one major spell that wakes me up.  It was accompanied by a severe headache for the first 2 weeks, but the headache has now subsided.  I also was experiencing low blood pressure as well.  When my lungs are listened to I am told that it is in my bronchial tree.  Any ideas what this could be?

[National Jewish]

An ongoing cough can be a side effect of a group of medicines used to treat high blood pressure called angiotensin converting enzyme (ACE) inhibitors.  In a person who has a normal chest x-ray and who doesn