I was playing a new toon and as soon as I got into a bg match my health went from 30k to 14k. Stam and Magicka too were also really nerfed. This is with food up too.
I remember reading something about a change, idk if that was it though.
But I just tested myself and yeah level 29 with decent gear and glyphs I was barely pushing 20k health. Granted I had no points into health, but before this update it would not matter.
Sustain was always really bad for me too. I had to walk everywhere otherwise I would have zero stam by the time I found a fight.