Please help me identify the disease causing my Bearded Dragon's peculiar symptoms?

I have 30 years expierence with pet reptile husbandry from geckos to pythons. Even the best pet owners run into sick animals occasionally and I am famous for the "sympathy buy" at pet stores. Naturally, a handful of my reptiles have developed or came to me with a disease or 2. Up until now I have always been able to identify, successfully treat & cure the disease affecting the animal or at least make the non curable as comfortable as possible. I bought my 1st breaded dragon 9 yrs ago & am now the proud owner of 5. Titan, the 5th, was a "sympathy buy" from a pet store 2yrs ago. There was not much background provided concerning him except he was a 13 inch 1yr old male. At the store, I noticed he was larger than normal for his said age, very aggressive for a dragon, proportionally bigger head, very jerky movements, preference to drag than walk & difficulty catching crickets (overshoot them every time). It has been 2 years of Titan getting the same care & set up as the other 4 dragons. The 4 are flourishing but Titan's symptoms only seem to worsen. I fear I may have to put him down in the next year or 2 if I can not find a way 2 treat or reverse these symptoms he came to me with. Since I do not have proof of his actual age, I am inclined to think he has normal old age symptoms except for the inside of his mouth is ORANGE not pale or grey or pink, his crystal clear eye cornea's bulge out 3x's the thickness of the other dragons', his weight and activity levels have declined so much I started feeding him with big tweezers (his aim is so off I got tired of my fingers getting chomped) to keep him from wasting a way. It is not MBD, not impaction, he is not paralyzed from traumatic injury and he has been treated for internal parasites. I need to know what disease causes ORANGE mouth and tongue, bulging cornea's, and slowly wasting away. Titan and I Thank you for your time.