You won't get complete relief until you clear the sinus infection out. Have you seen a doctor to have it evaluated?
I didn't get enough help from my little teapot, there wasn't enough flushing with sprays, even the pressurized ones. I like the NeilMed best when I have gobs of gunk to flush. You can make your own rinse with 1/2 tsp salt, a little baking soda, and adding a couple of drops of baby shampoo helps cut the stickiness of the bacteria so it can't form a plaque.
It's interesting to note that the maxillary sinuses drain upwards, so you have to tip your head down quite a lot to get them cleaned out. If you're not getting some dripping from them after doing your rinse and then leaning forward, the passages may be blocked. Another reason to see the ENT doc.
Antibiotics don't get to sinus infections very well, from what my docs have told me. There just isn't enough blood circulation in the sinuses. I sufferred for years with partially treated infections, even after sinus surgery to open the passages. I still have some blockage from a deviated septum which was not repaired then. I finally got the infection licked when I was in the hospital on IV antibiotics for a month, for a different problem.