welcome to healthcare magic forum,
As said by you that u r recovering from bronchitis
, it means u would have had a many medicines, so ur canker
sores could be due to those medicines commonly known as drug induced gastritis
. also many other reasons for canker sores which u must rule out is Constipation
, Reduced quantity of water intake, Lack of proper sleep, Stress, long standing illness, Acidity?
As u r out of country advised u to get an antacid
and start it of daily before meals once a day. along with this have a proper meal which should be properly seasoned and not pungent, have proper sleep and make ur sure u have regular bowel evacuations. and relax. if u can get homoeopathic medicine then suggest u to take Borax 30 two times a day for 5 days. along with this also u can apply (paint) glycerine on inside of ur mouth 2-3 times a day to relieve u of ur pain.
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Dr. Rooma Ramnani