You should have no problem whatsoever. Just take whatever medicine you still have with you and show it to the pharmacist. The brand you might be used to. might not be on hand but all pharmacies have the books that list almost any medication produced worldwide. If your brand is not available he'll be able to provide you with its exact equivalent.
Remember that Germany produces or has invented at least 50% of the medications used in the US and produced under license.
In some large cities there are so-called international "Apotheken" try to localize one of them.