The best advice I can give you is to find a Schroth specialist in your area OR a physiotherapist that has been trained in SEAS.
Both SEAS and Schroth are currently the only methods that have a certain evidence base.

Schroth:
dr. Rigo in Barcelona would be the person to ask..... Institut Elena Salvá - Tratamiento rehabilitador de escoliosis y otras deformidades de la columna. Barcelona
dr Rigo educates physiotherapists to become Schroth specialists, I presume they will have list of all the Schrothspecialists in Spain.
SEAS:
There is one physiotherapist in las Pays Bascos who was trained as a SEAS therapist... do not have his email... maybe you can find out more by going to
SEAS Accreditation: people I am the other one, but I live circa de Malaga and am not always in Spain sorry....

Good luck and really try to find a specialist to help you train.... you need to look after your back your whole life )

regards

Esther