Hello!
As it happens, I've just started 'hard HBOT' treatments (2.4 ATA). I have travelled to Romania for them where the cost is 80 USD per session. I have had three treatments so far. I'll be posting about it on my YouTube channel regularly so you might want to follow my progress there.
Here's the first video.
So far I really feel the oxygen getting into me. I feel a bit brighter and more with it cognitively.
The first session was hard on my body and I wasn't sure if I should postpone the 2nd one. But I did it anyway and actually felt better. I am feeling optimistic.
The pressure in the ears was strong during the pressurisation phase of the session. However, it was much less in sessions two and three. Apparently this is normal. I recommend practising the Valsalva manoeuvre in advance and to get good at equalising your ears.