The rate of pressure change in diving is much greater than when ascending and descending in a commercial airliner. You may be able to tolerate a relatively slow descent from 8000 feet to sea level in an airplane, but that's a pressure equivalent of 8-9 feet of sea water. It would be much easier to get behind in equalizing while descending in the water, especially if there's still inflammation present in your middle ear, which seems likely given your description. This would effectively close down your Eustachian tubes and make it even more difficult to equalize, which would put you at risk of re-traumatizing your middle ears.
Best regards,
DDM