I am wondering if my sentence sounds natural.
As the doctor palpitated David's wound, David gave a long, agonising moan.

Student or Learner
I am wondering if my sentence sounds natural.
As the doctor palpitated David's wound, David gave a long, agonising moan.
An agonising moan would be one which is excruciatingly painful to hear. While that is not impossible, "agonized" (American spelling) is more likely here.
I am not a teacher.