I do believe there is reference mental disease in the bible, Christ calls them 'evil spirits.'
Here is something i read a while ago that might be of interest to you;
Mar 9:25 When Jesus saw that the people came running together, he rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee, come out of him, and enter no more into him.
We prefer to call them ailments that are the result of genetics or a chemical imbalance in the brain, or epilepsy or germs; any of the diseases caused by these conditions. But the scriptures call them all "spirits of..." whatever.
1 Kings 22:19 And he said, Hear thou therefore the word of the LORD: I saw the LORD sitting on his throne, and all the host of heaven standing by him on his right hand and on his left.
1 Kings 22:20 And the LORD said, Who shall persuade Ahab, that he may go up and fall at Ramothgilead? And one said on this manner, and another said on that manner.
Was Ahab's carnal mind schizophrenic? 'One after this manner and another after that manner?'
Christ was and is able to heal all these, and he did as we saw above, He called them deaf and dumb spirits. I believe He can heal you as well my friend. All i can do is pray, and i am deeply sorrowed to hear that you are struggling with this. I will do all i can, unfortunately it is not much, it is all in His hands, and up to Him my friend. He knows what Hes doing, and He will not do anything that you could not handle.
Love, peace and mercy in Christ.
Sincerely,
Alex