Q. Dog acting weird. Anxiety, peeing on floor, following male dog, and very hungry. Maybe coming in heat? UTI?
A. It is possible she is coming into her first heat. Typical early symptoms of estrus as it is called include: change of appetite (though typically decreases), personality, being more clingy or aggressive/grumpy than normal with other dogs, swelling of the vulva (1-7 days before bleeding begins), bloody discharge, tucking of the tail.
Some of her symptoms could be explained by this but if it persists and you do not notice she is in hear, or things get progressively worse in the next short term a check up is always recommended.