I don't think we would say either -- the verb "gets" isn't right and I'm not so sure about "fluctuating." Can you explain what you mean in other words -- what are the conditions you're describing -- and we'll try to help. It is spelled business, by the way.
You can say, "The business environment is fluctuating," I suppose, but it doesn't really tell you anything (although it may be all right in a situation where you're just making a general observation to other business people you've been talking with).
But your explanatory sentence really gives us some information: Banking, workplace and tax regulations all seem to change frequently. (Or something similar.)
In a business context, prices are usually said to be fluctuating, i.e. going up and down all the time. This may well indicate a dynamic process or environment, albeit in a strict technical sense. But dynamic is also a "positive" word, generally speaking. It implies power, progress and gain.
I may be wrong, but I think the business situation you're trying to describe is negative, rather than positive.
Therefore I would much rather say The business environment is becoming increasingly volatile (a more "negative" word in a business context, because rapidly changing prices, tariffs, regulations and so on bedevil accurate profit predictions and investment decisions).