bro the greatest durood is that which we read with our prayer every day
Allahumma sallialla muhammadin wa ala aali muhammadin kama sallayta ala ibraheema wa ala aali ibraheema innaka hami dummajeed
bro why dont you read that, and recite praises of ALlah (SubhanAllah, Alhamdulillaah, Laa ilaaha illalllaaahu wa Allaahu Akbar) as many times as it takes for your heart to feel better