Another option if you have the room - is cut on your kitchen counter tops.
Another option is to sit in a adjustable height chair, where you may not be leaning over as much.
Take frequent breaks and do some stretching and reaching in the opposite direction to loosen tight muscles.
Try to notice if you are tensing up muscles you don't normally use when cutting.
If the muscle pain is really bad, a heating pad for short periods of time might help.
Hope you find some helpful ideas here on this site. Don't give up!