every time i go more 20 m i feel panic and I'm professional diver !

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My best friend, professional diver, cave diver/instructor, tech diver/instructor for more than 20 years. He recently started having symptoms you described. Went to a cardiologist, 90% blockage in one of his arteries. The fact you're a smoker would be a concern, a day or two not smoking doesn't clear blocked arteries.
 
Any inkling of vertigo when it occurs?
 
hello friend's i have a big problem now and i need to get your opinions..
I'm a professional diver with more than +1000 dives, i went more than 40 and 50 meters many times... also i work as dive guide .
last few dives if i went more than 18 _ 20 meters i feel like I'm going to panic and heavy breathing and heart beating so fast ( some times i feel like i will run directly up )
and it fix when i go up for 12 _ 15 meters
...
it happend in separate times and in different dates ..
and i never had this befor I'm smoker and non alcoholic and i take no medicines.. i tried to stop smoke for cuple of days and went to dive again and same thing happened..
what do you think guys ?!
are old are you ? Smoking is a bad habit if you will like to enjoy the sport quite smoking. Personally i don't do these deep dive any more. i stay shallow and in control.
 
If you tried different tanks and same problem, the next thing I would try is to use a different regulator. Try to use your octopus instead of your regulator, maybe it will work.
i did also, and because i dive fron different places they refill the tanks from different compressors
 
are old are you ? Smoking is a bad habit if you will like to enjoy the sport quite smoking. Personally i don't do these deep dive any more. i stay shallow and in control.
I'm 32 years, and yes also I'm trying to quit smoking
 
I think we can safely discount witchcraft.

Let's look at more likely causes:

1) Bad air - you say you've checked this.

2) Regulator issue - it could be restricted airflow or (my guess) something that doesn't allow the first stage to compensate for the depth like a broken or weak spring. Can you borrow a known working reg for a dive to see if it makes any difference? If it's a reg issue it's most likely the first stage in which case switching to your octo won't help.

3) Medical issue - let's see what the doctors have to say, but I'd check on the regulator first.

4) Psychological issue - unless there was some sort of emotional trauma that could have triggered such a reaction, I'd hold off on this possibility until you've explored the others.
because i tried all this .. and nothing emotionally so i think i will check a doctor
 
I think it’s either a crappy regulator where perhaps the IP is low and not putting out enough gas, but more likely, I think you’re getting Narc’d which is why, when you ascend, the feeling goes away.

First, try a new regulator. At the very least check IP for ~140psi

Then, if that doesn’t fix it, add a bit of helium to your mix (get an instructor to dive with you if you’re not certed for helium)

One of those things is going to be the culprit.
i will try that, thank you for your advice
 
How were the environmental conditions? Could it be CO2 retention?
 
My best friend, professional diver, cave diver/instructor, tech diver/instructor for more than 20 years. He recently started having symptoms you described. Went to a cardiologist, 90% blockage in one of his arteries. The fact you're a smoker would be a concern, a day or two not smoking doesn't clear blocked arteries.
hope he getting better .. i will check a doctor also and see where it will take me to
 
https://www.shearwater.com/products/teric/

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