Just finished my 5 day Rx of Azithromycin and hope the worst is over. Took it on empty stomach for first 3 days (now I know better) and had very little food on my stomach due to lack of appetite from URI. Well I get the Big D but only once a day...about 4 hours after taking this Rx. (Can eat other times with no problems at all!!) How long can I expect this to go on??