12 years ago in the Arabian Gulf I was given nine courses of this drug and sometimes in combination with other antibiotics to attempt a cure over 14 months of a painful chest infection and symptoms just like yours.
Desperate and almost incapable of functioning I rang for the hotel doctor whilst on a trip down route and he immediately said I had....
"Symptoms of "Adult onset asthma"...he was an ex RAF aircrew doctor and had seen it before in pilots incapable of handling secondary smoke from the other cockpit crews fags.
He gave me two sprays to use (A brown and a green) and the relief was almost immediate and I had my life back.
After these sprays were finished I did not reorder anymore and I waited to see if the symptoms returned..... luckily they did not....and I banned smokeing on my flight deck.
I also found out that too many antibiotics made the soles of my feet peel
and chunks of skin come off my toes which was not nice.
I have not had an antibiotic in 12 years and since avoiding smokers smoke never a throat or chest infection.