Yo SeaDemon,
Sorry bro, lambat reply. Actually I had an experience with this case before, not me laa..ada one diving instructor, went diving in Phuket, after dive had similar symptom as you did. Went to the hospital there, the Diving doc diagnose him as having Inner Ear DCS. Actually Inner Ear DCS and Inner Ear Barotrauma are a bit difficult to differentiate clinically, except that the former occurs on ascent and the latter on descent. Both will present with tinnitus.
As for this diver, he actually had recompression treatment in Phuket several times, and said that the tinnitus is slowly resolving. He came over to Lumut for several sessions as well, but did not have any improvement.
I tell u what, u can come over to Lumut, see ur old pal Kol Halim before he leaves, and ask his opinion on this. Several sessions inside the recompression chamber might do you some good...