Nothing is something because if something is nothing while nothing is not something, then something may be nothing but on the other hand, if its really nothing but not something, it cannot be nothing = something.
Good then that something is not nothing.
Is something nothing?
No.
Nothing is something and something is nothing 
Problem solved now? 
No, what you said is wrong.
Then explain how the 'Big Bang' came about.
If there was nothing before the Big Bang as scientists say then the Big Bang could not have happened. Therefore there something=nothing and nothing=something
Within a state of nothingness there is always something, there can never be nothing there always has to be something.
This is irrelevant for deciding whether nothing is something. And you are right, that there can be never nothing, because "to be" implies existence, which implies "something". However, the "thing" in nothing is actually referring to the context in which nothing is used, so if somebody says "i did nothing", it means he did not do any action that could have affected the case in question, or if somebody says "there is nothing inside", it means that the thing he was looking for is not inside.
Pure nothingness exists only as a concept, and it isn't terribly useful, because other than a name, it has obviously no properties.
