[maytag]

I can understand about docs not understanding the needs of freedivers, but i also agree with atomichaggis.

What I would do if it were me, is to go to the GP and ask for a cardiac evaluation. I don't know how old you are or what your background is, but you can be totally fit, young, and still have cardiac risks. There is a higher probability of a cardiac abnormality killing you than a freediving-related issue.

I was at a marathon last weekend. 1.5 km into the race or so (practically at the start), someone died, cardiac arrest. Sorry if I'm a bit un-nervy about these things. Apnea walking is sufficiently stressful on the heart that you definitely want to rule out cardiac causes.

The GP probably won't know about diving/freediving-related injuries. But, it may still be of value and just tell your GP you have chest pain upon exercise and then tell him/her you want to rule out cardiac problems.

All the best.
Not-a-doc-just-concerned