Date: 202108
Local time of day: 0601-1200
Location: ZZZ.ARTCC, US
Aircraft: B737-800
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Cruise
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Coalescer Bag
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Flight Attendant (On Duty)
Reporter qualification: Flight Attendant Current
Human factors: Physiological - Other
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Detector: Person Flight Attendant
When detected: In-flight
Result: Flight Crew Overcame Equipment Problem
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: L2 door was making a noise that was louder than just the whistle you usually hear. More of a medium pitched hum. Called the pilots. They said cabin pressurization looked OK on their end. I looked at seals and put my ear up to an area that looked a little looser. It was definitely louder as we explored that seal. About a minute later I started to feel lightheaded and my ability to control my breathing/focus start to feel altered. I asked the Flight Attendant 'C' in the back of she was feeling different at all. She ended up feeling weird; too. Things started to feel like it was harder to focus and spin/euphoric feelings. Harder to breathe. She said; 'We need to get out of here.' And we immediately headed to the front. I felt that I immediately needed oxygen right away and to tell the pilots that something was wrong. I felt faint-like; was grey in color; and sweat on forehead. I felt like I was having a hard time with my ability to communicate as I was speaking with the pilots. The focus/cloudy feeling in my head was unusual and anything I've ever experienced. My breathing felt shallow and also rapid at times. I was able to tell the pilots and immediately went on oxygen. It took a while for my head and body to be able to focus and for the symptoms to lessen. Used almost a full bottle of oxygen.Sat in aircraft right; inboard jumpseat for landing; with the pilot's permission; in order to stay away from L2 door.Still was feeling lightheaded; cloudy; hard to focus feeling even after we landed throughout the night. And a little lightheaded the next day; too. Was checked out by the paramedics and went to the hospital to get checked out as well. FA 'C' felt better than I did more quickly but also mentioned she had never been through that before as well... and had never felt those feelings before; either.Maybe there was an air quality issue on my side that I was more exposed to? Or slight decompression/lack of oxygen by my L2 door. I did notice it smelled like dirty socks in the back galley later when I went to the back of the plane. Sat in L2 jumpseat; aircraft right; inboard for landing to avoid sitting by the L2 door for landing. With the captain's permission.I recommend having the door and cabin area on the particular tail number monitored.




Synopsis: B737-800 Flight Attendant reported a fumes event during cruise and experienced physiological symptoms.