CAA & FAA PPL steep turns are tested at 45 degrees angle of bank. Remind your FI this and politely ask him to demonstrate no more than 45 degrees AOB. If you allow the nose to drop which results in a loss of altitude and then try to recover with a load of pitch up, it can get a little uncomfortable. If you start losing altitude, ease off the angle of bank and then you'll need less back pressure. Thats' more comfortable than trying to yank it round the turn. Ensure the turn is balanced, keep those feet moving and keep the ball centered. A well executed steep turn should not feel like you're pulling 10g's in an F16.
Whilst the FI is demonstrating the steep turns (he should only need to demo them once or twice), look at the 'picture' of the position of the nose, relative to the horizon for both left and right turns. Glance in at the instruments and then look out. I would suggest at least 2/3 of your time you should be looking out. When your eyes are outside the cockpit, try not to look up at the outboard wing.
Steep turns are a part of your training and will continue to be all the way up to a type rating.
Unfortunately its going to have to be a case of learning to like them.