Stapes luxation

I am 36 years old. In 1996, I completed the Paddy in Maldives. During the third lesson, we were between 3 to 5 meters and I had some difficulties to stabilize. In order to reExplain me, the instructor went up to the surface with me.
After a few seconds at the surface I started feeling bad : I did not know where was the sky and where was the water. The instructor asked me to relax and to fix a point at the horizon but I was feeling worse and worse and finally vomited. The instructor decided to stop the lesson and we went back to the shore.
Actually they had to carry me to the shore and then to the bungalow. I was feeling totally drunk, could not walk straight and could not eat. As 24 hours later, those symptoms were unchanged, the instructor decided to put me back under water and after a few minutes at 3 m. something happened (unfortunately, cannot remember the physical feeling). We completed that lesson and when we came out of the water, the balance problems had totally disappeared and I was starving.
Once more - at the last lesson - while we were starting the dive, just after leaving the surface I had a strong vertigo with nausea, but it lasted a few seconds and the dive went ok.
The instructor requested me to visit an ear specialist upon return which I did and the diagnosis was that because of a problem of the drum texture which is not elastic enough under water pressure, the drum sticked to the bones regulating the balance. According to that doctor I had been lucky, because she had a similar problem with a gentleman but his drum sticked somewhere else and he became deaf of this ear.
A last detail which has nothing to do with diving, but may be completing the picture is that I am extremely sensitive to wind. It can be cold or warm wind, but immediately it hurts me behind the ears and I got used to always protect them when I ride bicycle, ski or even walk with windy weather.
I hope that in spite of the first diagnosis, something can be done and are at your disposal for any further info/explanation that you may need.

The problems you described was most likely due to middle ear barotrauma ending in both alternobaric vertigo and in a luxation of the stapes into the oval window in the first case and in a simple episode of alternobaric vertigo in the second.
Both seem to have been precipitated by a certain difficulty in equalization during the dive.
To better explain: the stapes is one of the three tiny bones that transmit sound and vibration from the ear drum to the inner ear. The stapes is the last of the three ant its flat end lays into the oval window, one of the two membranous communicating ports between the middle and the inner ear. The other is called the round window.
Although not very common ( more common is indeed the rupture of the round window, and this is probably the risk the specialist you mention referred to ) the luxation of the stapes in the oval window (a displacement of the stapes ) may occur as a consequence of a faulty equalization and the inward bulging of the ear drum, pushing the stapes strongly into the oval window.
Any difference in the pressure conditions of the two middle and inner ear cavities generates vertigo, with possible nausea and vomiting and eventually hearing loss too ( this is called alternobaric vertigo).
In normal alternobaric vertigo the event is usually temporary and short-lived, like it happend to you the second time.
As for the first episode, what the instructor did was both very incorrect and very lucky.
In fact the first thing to be done in similar circumstances should have been to immediately seek for medical advice, without waiting for such a long time and leaving you suffering those serious and debilitating symptoms. In fact an inner ear serious problem should have been an easy diagnosis even for a non medically trained diving professional.
Taking you again underwater was incorrect as it might have easily worsened the problem leading to an irreversible rupture of middle and inner ear structures, but it was indeed extremely lucky in that, very likely, the pressure induced movement of the ear drum, possibly facilitated by the equalization attempts, generated a movement of the ossicle chain and a replacement of the stapes in its proper position.
As for the future, I would suggest a visit by an ENT specialist who has some experience in diving medicine. If there are no functional or anatomical defects in your middle and inner ear and if the function of the ear drum is normal, there is no reason why you should not dive, provided that you learn the equalization technique properly and you avoid diving when having a cold of any airway inflammation or infection.