Travelling with Prescription Medications Through both France AND Spain over a Year's time

I am going to be abroad studying in France and Spain over the course of a year, and am on long term medications that are extremely important for me to keep taking regularly at exact doses. I'm not sure how easy it will be to get prescriptions for the medications at the necessary regular intervals in both France and Spain over the year that I am abroad, so it would be more convenient and probably safer for my health for me to carry the amount that I need for the full time I'm abroad with me, unless foreign prescriptions are accepted at pharmacies. My medications are anti-psychotics, seizure, and blood pressure medications, so they're not anything that is taken for recreational use or should be prohibited in general. Will France allow me to take a year's supply of medication into the country if I have the proper letters and notes of prescription from my doctors, or would I have to find a doctor in France that will continue to prescribe me my medications while I am abroad, and the same while I am in Spain? Alternatively, does Spain take prescriptions written by foreign doctors, so that I can take only 4 or 5 months of medication to France and then fill prescriptions while in Spain, assuming my medication is available there? I have found it very difficult to find information on the exact amounts they will allow according to length of stay, and whether continuing on to another country is taken into account.