Claritin can be taken once a day and the generic is inexpensive at Target and Walmart.
Zyrtec also is a once a day treatment for allergies. It's more expensive than Claritin but there is a generic for it too.
I'm currently using a combo of Zyrtec and Singulair for my allergies. Oak pollen is my main trigger. Thank goodness the trees are almost done flowering! Singulair works really well for me, but it only available by prescription and is pricey.
I'd also recommend a Neti pot. Walgreens sells Sinucleanse neti pots in their allergy section.
If you are breastfeeding, I'd ask a doctor before using Claritin or Zyrtec.
Hope this helps and you get some relief soon,
L.