Split Rock

I love cactuses! In my tiny little apartment i have a pot with four different cactuses growing in it. This morning i woke to find my favorite one, the split rock, completely withered up. I immediately gave it more water. Then i looked on line and realized i had actually over watered. it. I am very sad, it was so cute. I'm hoping that if i leave it maybe it will grow back... We will see I'm leaving for the weekend today so at least i'll get away from it. Im also wondering if its not getting enough sunlight in this foggy city. The flowers  on one of my other cactuses are no longer blooming... Its so sad. Maybe i would have been better off with an orchid... I just didn't want it to die when i go home for winter and summer breaks, but apparently cactuses can die overnight =(