Side Effects of Botox Injections for TMJ?

I had Botox injections in my face due to TMJ problems. My TMJ was caused due to trama to my face a year and a half ago. My oral surgeon injected Botox deep into my muscles in my face. For some reason he had to put it into my gums to reach my muscles. As a result I am suffering from soft pallate paralysis. I have a hard time talking and swallowing. Is there anything I can do to regain function of my soft palate? Is this a normal tratment to TMJ disorder? Please help with some advice.