I am a 36 Year old male. Overweight, smoker. Today I suddenly felt dizzy while sitting at my desk in office, there was a slight pain in the chest (upper part of chest near the neck). I checked the blood preasure, it was 100 / 70 (I normaly have a blood preasur in  the 115 - 120 range). I am currently taking a course of azithromycin for a cough, and it has been a little stressfull lately. I am a little worried, is it just low blood preasure or could it be something more serious.
So you're having some kind of infection and taking azithromycin. Having chest pain is cause of concern. Reason may be simple chest infection causing pleural inflammation called pleurisy you can assess if its localized sharp and increased with deep breath. If its like it then simple antibiotic and pain killer are sufficient. But more worrisome is if its cardiac or Ischemic. So u may need chest x Ray and ECG to diagnose after proper clinical assessment.