Looking for help with radiation fibrosis; Tips?

Looking for help with radiation fibrosis following radiation of head and neck and a modified neck dissection . I have had PT and do daily exercises at home for neck fibrosis and trismus. I also have a mouth stretching device called a therabite. Is there anything else besides physical therapy that I can do to help with this worsening condition? I am also experiencing occasional muscle spams in the back of my neck and have read that Botox injections may help with that. Any suggestions would be much appreciated. Thank you.