i spent about 18 months on just cetirizine. fwiw would still get flushing and hives, especially with aged foods or day two leftovers. mentioned it to my allergist and she asked if i was also on an H2 blocker. wasn’t. added famotidine to the routine and honestly it changed things. the flushing still happens with my triggers, but it stops way faster and way less intense. racing heart got better. GI stuff is still there but less chaotic. anyone else have that jump in improvement once they added the H2 to their H1? did it take you a while to realize you needed both?