I know how you feel. My thoroughbred in the three years I had her, managed to puncture first her hind leg, got really infected, then punctured at different times both her front legs, pulled the tendon around her knee, then punctured her hip, and the big whopper, tore her superficial flexor tendon which put her out of commission for 6 months with no guarantee she'd ever be sound again. She pulled through fine, though she had lots of restrictions riding wise for the rest of her life, but it was a rough three years never know how long I'd be able to ride her before she did something to herself. Fortunately they were all 'self inflicted', but I hated not having a horse. I finally sold her to a nice lady, who had a blast with her. Keep your head up, and keep looking at all the options, and in the meantime, just keep giving him love, and making sure he's as comfortable as you can make him. Hugs.