Have dry cough for 8 weeks with pain in rt. Lower rib/flank area & rt. Mid-chest when coughing & inhaling. No visible swelling. X-ray & blood test ok.?

Could be . . . Bronchitis could last for a while usually with these symptoms. However it could also be an allergy problem with post nasal drip and frequent throat clearing. The rib pain could be because you are coughing so frequently that your rib muscles are in spasm. You should see a physician to be diagnosed properly.