In my experience are not as reliable as divergences on the indicator itself -- which still isn't a guarantee.
If you think so, I'm afraid that your use of the histogram is going to get you into trouble eventually. I suggest you learn the construction of whatever indicator you use.
I think your chart shows absolutely nothing. In the context of one of the strongest bull trends in quite some time, trying to pick a top based on some indicator divergence, especially on something as short as a 5 minute chart in my opinion in foolish.
You're drawing the wrong conclusions. Note that after your "divergence", the price rallied and resumed the uptrend. Again, learn how the indicators you use are constructed. If you're going to use the histogram in this case, you may as well take your signals off a stochastic.