B737 Undifferentiated or Other Model
Distraction; Physiological - Other; Situational Awareness; Troubleshooting
Aircraft Equipment Problem Less Severe
Aircraft; Equipment / Tooling
On flight yesterday shortly after the pilots dinged for 10;000 feet; [I was] flying position 2. I heard a sound like air escaping; followed by a large popping of my ears. Immediately I started feeling light headed. I looked around the corner to see if it was just me and the agents were looking back and pointing at their ears mouthing 'What's going on?' I then rang Flight Attendant 1 and asked what was going on with the pressure. Flight Attendant 1 and 3 hadn't noticed anything was off. They contacted the pilots who said they'd work on it. We got no further updates during the flight; but I could feel the cabin pressure going up and down in waves. I'd start feeling lighter; look at my fingernails which has turned white; there'd be a slight pop of release; and they'd go back to pink. Upon landing; Flight Attendant 1 told me I could ask the pilots what happened. In doing so; they informed me the automatic controls for cabin pressure had failed; they were having to do it manually; and [said] 'I think I finally got the hang of this.' We received no further updates or briefings from the pilots on the issue. We continued on for 2 more flights. While it was never as bad as the first flight and the agents didn't mention anything; I could tell the pressure wasn't where it was supposed to be. I had a headache only while in the air and felt mildly light headed. While the agents usually insist Flight Attendant 2 move to the forward galley during flight; I insisted on staying in the rear near the aft oxygen bottles for the entire day. As safety is my number one job; and understanding the neurological effects of hypoxia; I deemed it prudent to have close access to the bottles in case of pilot error or mask system failure.According to [the] pilots; it was a failure of the automatic controls for cabin pressure.
IWA Guards work for ICE and these flights are transporting Immigration people.
Flight Attendant reported a sound like air escaping and pilot stated the automatic controls for cabin pressure had failed.