help about understanding tremors..

so i just wanted to see if some one can help me how i can make my boyfriend feel better. He has tremors and completley pushed me away from his life, He told me he doesnt want to drage me down with him and he feels he needs time to figure out what is going to happen to him. He told me his therapist thinks he has brain cancer but i think the therapist is wrong and only a doctor could determine that. I like to find a support group he can join or some where that i could go with him to help him.  He has lost all faith in God . I.m not sure why he was chosen to have tremors but he was. does any one have any good support groups i can tell him or what i can do becuase im completey broken and sad and i feel terrible.. Its so hard when you love some one no matter what they have and you cant find a cure ;(