Here is an authentic dua from a Sahi Hadith about shifa. Getting shifa becomes necessary if you are having health-related issues and what can be better than turning to Allah and His messangers's way? Let us make these beautiful duas part of our life. This dua for shifa is a must if you are having not just a physical issue but also for psychological and mental issues.
اَللَّھُمَّ رَبَّ النَّاسِ اَذْھِبَ الْبَأسِ وَاشْفِ اَنْتَ الشَّافِی لاَ شِفَائََ اِلاَّ
شِفَاؤُکَ شِفَائً لاَ یُغَادِرُ سَقَمًا
Allahumma rabban-naasi azhibal ba'si washfi antash-shaafi laa shifaa-a illa shifa-uka shifaa-an-laa yughaadiru saqama
English Translation: O Allah, Lord of mankind, remove my suffering. Heal me as You are the only Healer, and there is no healing/cure except that of Yours, it is that which leaves no ailment behind
Hindi/Urdu translation in Roman: Ay Allah. Logon ke Rabb. Takleef ko door farma de. Tu shifa day de, or Tu hi shifa denay wala he.