Moving to Spain - How to find MS Doctors

Our son married a Spanish girl and we want to retire in SPain to enjoy our grandchildren! My husband has MS and I would appreciate any help into how to find Doctors, Insurance, Medical Supplies on the Costa del Sol OR Costa Blanca! OR if this is too difficult, is it possible to live on the coast and see a doctor in Madrid? Thank you So much!

Have you tried any of the ex-pat forums for Spain? Things were much less complicated before Brexit though, than they are now.