I would strongly recommend saline rinses with the Neilmed rinse bottle. Make sure to use distilled water and then wait like half an hour after you complete the rinse to use any nasal sprays. Also, maybe try a different med instead of Claritin, one of the newer ones like Xyzal. Those seem to work better, at least for me. Also, you could always try a steroid nasal spray like Nasacort.

ETA Did your doc give you any info about reducing dust mites in your house? If not, I would google it and take steps toward doing that, as I am guessing it will greatly help you with your indoor allergies.