I agree with @bluebayou that I have never heard that you will automatically be reinstated at UCSD if you do not get into UCLA.
UCLA only accepts Junior level transfers and you will need at least a 3.7+ GPA if you want a good chance at transferring.
It is only been 1 week and you really need to give it more time. You might want to check out this link: http://talk.collegeconfidential.com/college-life/2016222-to-those-who-feel-lonely-homesick-friendless-think-they-chose-the-wrong-school-etc-p1.html