While it may have seemed like 30deg, I have never had an airliner much of 10-15 deg nose low. They do come down rapidly with that pitch. It is not uncommon to see rates of descent in excess of 4000fpm and the flight track shows an overall rate of about 4000frpm
At 39,000ft, the cabin altitude would have been around 7800ft so the leak must have been a slow one. Masks usually deploy at a cabin altitude of around 14,000ft. No masks. No cabin altitude near 14,000ft. The standard drill is to descend to 10,000ft. and not only to level off but to decrease the onset of pressure in the ears, most crews will begin to shallow the descent nearing 10,000ft.
But above 10,000ft, you will begin to feel the effects of hypoxia, lack of oxygen and the ride to KPIT for the last :30 may have been sufficient to induce some symptoms. Remember that being dehydrated, having alcohol and other factors increase the onset of hypoxia.
That the company would say nothing happened is most odd. The crew would have had to advise ATC of the problem and while they may not have declared an emergency, it certainly fits the criteria for an incident.
Ms. Brosnan may be correct in that the crew may not have reported it. Some crews don't (??). But the FAA will probably have some record of the event and if not, your inquiry will gain their attention. You can google and find the FAA office in Pittsburgh and talk to them about your concerns.