Anyone ever taken short term disability from work for gallstones?

Currently in constant pain. Chronic fatigue that may be from being up all night in pain. General feeling of just unwell. How likely would I be to get approved for short term disability leave through work short term disability insurance? I could probably take FMLA but I am not able to take unpaid leave

Edit: I do plan on having surgery to remove my gallbladder once it’s offered to me. We are in the beginning process so I know it may take some time. I’m wondering if it’s possible for short term leave until the surgery?