My Air Handler System Dilema

Hmmm… I take Zyrtec every day for allergies.  And my parents both tried it recently and asked me if it makes me feel really tired and worn out?  I do feel that way most of the time but had not given any thought to the possibility that the Zyrtec was the culprit.  Hmmm… I skipped my pill this morning and used the nasal spray my doc gave me.  I don’t feel nearly as tired and worn out as usual, and I’ve actually gotten some stuff done without beating myself mentally into action.  Uh…  hmmm…  I wonder what this means?  (And my head feels like crap from sinus pressure.)  I still have a good bit of it in my system and it would take some time to clear out my system.  I wonder if I was off of it for a month if I would feel better and exactly how bad the allergies would be?  Which is worse?  Worn out or constant runny stuffy nose and sinus headaches?  And the real kicker is that when I really get a big allergic reaction at a time when my immune system is low – then I invariably end up sick for a week or more.  I wonder where God keeps the replacement parts.  I could do with a whole new "air handler" system.