You're allowed to straight out ask for any sort of treatment you feel would be helpful. Unfortunately, it doesn't mean you will get it as it would depend on availability in your area and whether the doctor thought it would be helpful for you. But it sounds like you have good reasons for wanting to try it so it's definitely worth asking about.
Some areas also offer it on a private basis, and, near me there is a voluntary organisation that does various therapies including art for a donation.
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