My baby needs a specialist.

My boy Leon has been dealing with some type of infection inside his nose/eye duct since mid December. I'm 900$ in the hole, he has been to 3 vets, one of which was an eye specialist, and he has been on 6 different medications, 5 of which were all different types of antibiotics. I'm to the point where I'm having to borrow money now and drive him 4 hours to a teaching hospital where they can have a different set of specialists look at him and give him a head scan that's going to be over 1100$ for the scan and consult. That's not even including any treatments they'd do on him! I'm at a loss. I'm like...so disheartened. I'm hemorrhaging money and my boy isn't feeling ANY BETTER. 
Thanks for your help.