G.R.
i feel your pain my twins are having this phase too and i know is pretty terrible i don't know how to handle what i do is when one is having a tantrum i take him to his room or i take him to another room and i let him cry he does not cry for more than 3 min soo is not so bad
also
Using the "out of sight, out of mind" strategy also works well at this age, when it's hard to discipline. Childproof your home and simply put things out of sight that baby shouldn't have.
Ignoring your baby's bad behavior at this age and until you know baby "gets it" is actually the recommended treatment.
When distracting baby or changing the situation is necessary, be sure to offer an alternative. For example, take away the knick-knack and in a cheerful voice say, "No! No! How about your purple block? It's so much fun to play with blocks!"
Tell baby what she can and cannot have, in a flat and factual tone, with an explanation and love. "You cannot play with this because you will hurt yourself and I love you too much to let you hurt yourself." Even if you don't think she gets it right away, the repetitiveness will help her to figure out what you're saying and what the boundaries are.
http://life.familyeducation.com/baby/discipline/44249.html
is a good site
hope this help
G.