The general emergency number to dial for police, fire brigade or ambulance service to take you to a hospital is: 112
If you are on regular medication, it might be a problem to get the exact same drugs in the Netherlands. It depends very much on which General Practitioner you visit whether you get the exact prescription you want.
Some GP's are not very keen on giving extensive additional medication. They first try other treatments. As said before, it depends a lot on which GP you choose.