Air carrier Flight Attendant reported a fumes event during departure taxi which was described as fuel burn off fumes and odor. At the same time the Captain communicated with the cabin crew and decided to return to departure gate for maintenance.

Narrative

During taxi out the cabin filled with fuel burn off fumes and odor. I could smell it from my jumpseat at 1L/R and the captain called to ask if I could smell fumes because him and the FO could smell it strongly as well. He told us he was turning on the APU to help with the odor and that we would be returning to the gate. I notified my 2/4 Flight Attendants (FAs) and they also let me know they were smelling it strong in the aft. I experienced some eye discomfort and nausea until we were on APU power and when the door was opened I did begin to feel better. I went to seek medical treatment and did not continue on the trip. My lab results showed abnormal percent carbon monoxide. Suggestion: Better maintenance on these aircraft with known fume events. We felt pressured by mgmt when we were returned to the gate to continue to fly or to make a choice quickly on whether we would continue or not and I am glad I took care of myself instead of the operation but I think it would been safer to have it be policy that the crew is taken off and checked out. What if we all contiued to fly and we were exposed again on the next AC? I wouldn't want to fly with pilots who had just been exposed to carbon monoxide.