The overlay shows very similar price action in the three months running into the referendum. The only difference is that the MIB appears to have passed it's low point and is on the way back.
Remember that a few weeks after the Greek referendum there was the huge crash of 24 Aug 2015.
With the choppyness and slightdowntrend recently INDEX:MIB is going to see a bullish jump basic support and resistence along with the TL being broken shows a reversal (OVERSOLD). Price is well below the 50 and 20 EMA