On google, I found the Aghia Sophia Childrens Hospital in Athens has a mental health hotline and crisis hotline. Can you get their telephone number? The next thing I would recommend is calling your local hospital for a mental health or teen crisis number. They will be able to give you some numbers that you can call at any hour, day or night.

If you are having distressing symptoms, it might be best to just GO to the hospital, if your mom will take you.