These sort of conditions can be quite unpleasent, but the best way to handle it is to relax. Don't fight the aeroplane to try to maintain accurate height and heading, just correct the worst of the upsets and put in just sufficient control inputs to keep it pointing approximately the right way. Most of the upsets will cancel each other out if you let them.
You generally find that at the point in the flight when you have to fly accurately - the landing - it realy isn't a problem since the turbulence is far less very close to the ground.
When I first started flying, very bumpy days really bothered me. Now, I find they not such a problem, but still not particularly enjoyable.
SSD