A Flight Attendant reported that at cruise the 'A' Flight Attendant had an allergic reaction which required medical attention including EpiPen injections to control. She was still very ill upon arrival.

Narrative

A Flight Attendant called aft after first beverage service; alerting us that she was having some kind of allergic reaction and needed assistance up front. The 'B' Flight Attendant went forward to aid her while the 'C' and I did the second beverage cart. While on the cart; the 'B' came to the cart and requested the [medical provider] headset. Soon after; the 'A' Flight Attendant paged for medical assistance; to which we had several responses from nurses on board. We let two nurses head forward and delivered the EEMK; per [medical provider's] request. The 'A' Flight Attendant was lying on the floor in the forward galley as the nurses tended to her; and eventually moved to the jumpseat. She was shaking violently and was nauseated; so the 'B' aided her in moving to a main cabin seat; where she sat next to one of the nurses. During the final descent she came forward and alerted the flight deck via interphone that she was having another bout of hives and needed another shot of the EpiPen; and following her was the nurse seated next to her. The crew and I encouraged the 'A' Flight Attendant to return to the main cabin seat for landing; and I sat alone in the forward jumpseat in the inboard position for landing. As we were approaching our destination; passengers seated around her stood up and were waving for help; but with the runway in view we asked everyone to be seated immediately. During our taxi into the gate I walked toward mid cabin; where the 'B' was also headed to check on her. Everything seemed to be relatively in control; other than the 'A' looking shaky; so I returned forward to my jumpseat. When we parked at the gate; paramedics met the flight. Customers remained seated while they proceeded to her seat to assist her; and she attempted to walk down the aisle and off of the aircraft. A Flight Attendant on airport standby was called and able to step onboard so we could meet the minimum crew requirements. Around row 6; the 'A' Flight Attendant collapsed and suffered a violent seizure; with the passengers in row 4 attempting to loosely restrain her legs. The Agent meeting the flight hadn't been informed there was a medical; so I briefly explained what was happening to her. She called for a ground Supervisor; who worked with our Captain and Operations to have the aft stairs pulled up so the passengers could deplane. This took approximately 15 minutes from block in; since they had to move some ground equipment. Several First Class passengers were able to deplane after the medics put the 'A' Flight Attendant on oxygen and stabilized her somewhat; although she was still intermittently unresponsive and appeared to suffer a few more seizures. The 'A' Flight Attendant was able to be moved to an aisle chair and brought off the aircraft.