What Should I Do To Clear Upper Sinus Before Maintenance Treatment?

I feel I have a serious sinus problem. I have been to the ent drs and still get no help. My head is so stopped up and I never get any relief..... this has been going on for a long time. The ENT did allergy test and tried the shots but I strongly feel I need help to clear the upper sinus before maintenance treatment. It is so bad that it brings me to tears..... it has now reached a point where my ears ring, my ears are stopped up and have not unstopped for a long time. I feel no one takes me serious and when they look at me, they think I'm fine because on the outside, I look fine. How do I get a doctor to take this more serious? I strongly feel I need antibiotics to clear this up but the doctors just want to give me nasal steroid sprays which do not help. This is ruining my every day life. I have tried several times to boil water full of salt and sniff the steam but I get no relief from that.... I think the problem is beyond where the steam may reach. All the pressure seems to be in the forehead, behind my eyes, and ears. Is there something else I can try? I might also add that this has been going on for over a year and I've given up going to the doctor because I always get sent away with no relief.