Bri, I'm sorry to hear you're having a hard time with school. I completely understand the sciences are not easy and are labor intensive. You know what you want, if you decide to leave UT make sure its because its what you want not because its hard.
One thing you did say though is that you do not like the sciences. You do realize 90% of Vet Tech school is going to be science classes right? You are going to have to take biology, anatomy/ physiology, nutrition, etc all over again. Are you prepared to do that?

Take a semester off to get your priorities straight and what you want figured out. I would never advise anyone to take more than that off. It is extremely unlikely you'll go back at that point.

Only you know the true reasons for you wanting to change your major. That's okay- it happens all the time. However, make SURE you do figure out a major you want to do. Living on 11.25 an hour on my own with little help from my parents has really put into perspective how hard life is and has given me the motivation I have for school. Cause truth is, no one wants to struggle forever! Get it out of the way now!