if one was taking a 7 day dose of Doxy for clamydia treatment but missed the 4th day (AM/PM doses) but carried on as normal the following day for all remainder of the prescription (days 4, 5, 6 & 7), could this be an issue?
Yes, it still works, depending on where you live. Some areas are showing more resistance than others.
Try increasing your water intake. You may have some irritation or dehydration. If the burning is really bad though, for sure follow up with your doctor.