you can go in to what ever agency this is for and let them know you have trouble writing things down, they will have someone sit with you and have you answer the questions orally (here in america we have a law that requires work places, government offices like social services, social security and others to offer other formats and people to help with situations like this, the law is called the american disability act law.... short version if someone has trouble reading or writing they must administer the forms orally with someone from their office filling in the forms as you tell them the answers.

my suggestion contact who ever these forms are for and let them know one of your disabilities is writing/filling in these insurance forms. they will set an appointment with you for when you can go in to have someone help you with them and if you cant get to them they can also have you do the forms with one of your treatment providers.