Rifagut 550 anxiety, fear, tension.

I was given rifagut 550 twice a day for 10 days for ocassional diarrhoea. And today is my tenth day I was having vertigo from last few weeks may be due to consiousness due to gut grambling and gas. All symptoms had gone from last 1 week. May be diarrhoea was due to whey protein using regularly for past years Now a days whey protein contain dihestive enzymes NOW THE PROBLEM IS STARTED DEVELOPING FEAR AND ANXIETY DUE A SENSATION IN INSIDE OF PENIS ANXIETY FEAR TYPE  IS LIKE WHEN SOMEONE NEED TO PEE A FEAR TYPE FEELING IS COMING. I STARTED MY RIFAXIMIN ON 11th of april and today is 20 10 days are completed I want to discontinue What if i don't have any condition that needs rifaximin. Is this a side effect