What is Heavenly Father trying to teach us?

Another disappointing blow to Josh this morning. For the last 9 months his eyes have not been working correctly. He has had a hard time studying without getting eye strain and headaches. Somehow he made it through his 2nd year of med school with a B average! I am so proud of him! We think we finally found an Optometrist who can help. He put atropine drops in Josh's eyes and gave him a new prescription. With all the delay in studying Josh has had to put of taking his boards until July and this means taking 2 months off of med school. The boards pretty much determine what specialty you will go into and Josh really wants to be an ophthalmologist (ironic, we know). He needs to do well on this test so we felt it was for the best to delay his boards 2 weeks. Well....he noticed some redness on his sclera (the white part of your eye) the other day and the Optometrist assured him it wasn't conjunctivitis ("pink eye") but most likely dry eye and told Josh to continue wearing his contacts. Josh has been religiously applying lubricating eye drops and even bought a humidifier to keep his eyes moist. This morning he woke up with severe pain in his eyes and his sclera is completely red on both eyes! His eyes were puffy and he could barely open them. I had to go to church without him. We are trying not to ask "why?" but instead "what?" What are we supposed to learn from this? What is the plan for us? If Josh can't study, how will he take his boards? Josh is the most intelligent man I know (sorry dad, you've been replaced) and I want this to be reflected on his test score so he can achieve his dream. Please pray for him and his eyes. Josh remains faithful, but after 9 months of this I don't know how much more he can take.