Question: "Allahumme inni as alukel mu'afate fid-dunya wal-ahireti" Is this dua saheeh and where is it recorded?
Answer: I don't know, but if you browse this page you'll find similar ones. In any case, there is nothing wrong with making this dua. The meaning is sound.
Question: Can you please provide more duaas for aafiyah?
Answer: Before bed blow three times in your hands, then read the 3 last suurahs of the Quran into the hands, then blow again 3 times and rub your hands on all of your body, starting with the face and head. Repeat this procedure 3 times before sleeping every day. The Basis for this is mentioned in Al-Adhkaar by Al-Nawawiy.