headaces when diving

Shalom, I have been scuba-diving for the last 15 years and never had any physical problems (and still don't). However, in the last 3 years, when I try to dive (without equipment) to a depth of 1-2 meters in the swimming-pool I get very strong headaches which stop as soon as come back to the surface. I was wondering what could be the cause for this, is there anything I can do to stop these headaches and whether I should continue to scuba-dive. Thanks Shlomit PS, you can answer in Hebrew (I just don't have a Hebrew key-board