6 weeks ago, I took a course of Macrobid (generic) for a UTI. After completing the 7 day cycle, I developed excruciating heartburn, to the point of tears. The following day (2 days after Macrobid) I started itching (scalp, chest, neck, arms...) This has gone on for 6 weeks! I have been to the doctors, ER, allergist to no avail. ALL of these professionals claim that pruritis (chronic itching of the skin) could NOT be caused from an anitbiotic this long after completing it. I take 300 mg of Zantac and 180 mg f Allegra a day, which does seem to help. Has anyone had an experience where they finished an anitbiotic, and WEEKS later they are releasing histamine? Is it just coincidental that I finished the Macrobid and these symptoms appear?