6 months into nursing my twins

My twins are now 6 months old. We've been nursing the whole time. For the first three months of their birth I was taking 1/2 a dose of Zyrtec daily. If I missed a dose or two it took about 24 hours and then I would brake out with a few hives. I didn't let it go any further than that and I would take the Zyrtec quickly. About 3 months ago I noticed that if I missed a dose it was almost 48 hours before my skin would get so itchy that I couldn't take it anymore, but no hives. My skin would get splotchy -a precursor to any of my hives forming. I started waiting to see how long I could possibly prolong my next dose of Zyrtec. I am now to about once a week taking the dose. It hasn't been as life horrifying this time around. I don't know why. Maybe my body is more adjusted this time to the nursing or post delivery hormones. Maybe there is something to the notion that its worse with boys than with girls. Maybe there is more of an environmental factor than I thought and its not a factor this time. Or maybe with all the other stress in my life God is just giving me a break this time around. Whatever the reason I am grateful.
My allergist said that I should try to take as little and as seldom of a dose as possible because your body will start building tolerances and it will require larger doses to have the same effect on you.
I am so thank for all of you're comments out there. I hope that all ya'll find as much comfort in knowing that we are not alone in our struggles and that we're aren't crazy as some out there want us to think we are.
good luck to all of you.
As my journey continues I'll update my progress.