Josh's Sinus Issues

They just keep going and going...kind of like the energizer bunny or Josh (boy those two have lots in common!).  So we were at ENT on Monday, because Josh had a very thick, junky nose again.  He just finished 21 days of antibotics, it seemed ridiculous, but not surprising.  Poor kid has had an on and off again sinus infection since mid-December.  The ENT suggested we cut out all diary, thinking it was a food allergy.  Okay, we can do that - not looking forward to it but we can do it.  We have done tree nuts and soy - it is manageable...we can do it.  But then I kept thinking nothing else seems similar to the reactions he was having with those food allergies.  I made an appointment with his allergist, I wanted to discuss the possibility of food allergies again with him and get to the bottom hopefully of it.  So we went today, we saw the first doctor (an associate doctor in the practice who was very nice and listened to everything).  Thank goodness for Kristin, she kept the other two kids - it is hard to focus on a conversation with all 3 in the room! 
So the first doctor went and got the head allergist to come and talk to us.  We are looking at possibly a couple scenarios.  The one he feels is likely is a continued sinus infection that has not gotten better, that has been resistant to antibotics.  The couple days off antibotics after the duration was long enough to give the "weakened bugs" to "revive themselves."  The doctor feels like Josh may need 5 weeks of antibotic to get rid of the infection, but we'll check his sinuses with a CT scan to make sure they are working. 
Another possibility is the possibility of an immune disorder.  We've been down that thought road before, pretty sure we have done that testing.  They are going to get the records from our previous allergist and be sure that the tests have been done.  Otherwise, we'll do those test and may also have to do a "sweat test."
If there isn't an immune disorder (which thankfully seems unlikely) and antibotics just don't seem to help there is also the possibility that he may need surgery to clear his sinuses out.  Ugh, poor baby!  We have a CT scheduled for the 9th of May and will do 25 days of antibotics - I hope that is the end of the journey for the poor kid though.