In cases such as yours, confirming exactly where the leakage is occurring is essential. It sounds like
yours is thought to be in the thoracic level, but if this has not been confirmed, appropriate imaging with CT myelography, or cisternography. Sometimes when epidural blood patch is not successful, extradural blood patches may work.
Bedrest, hydration with intake of a lot of fluids, and analgesic medication are necessary adjuvant treatments.