You have a couple options. Maybe you could mill the nuts into a powder or nut butter or just stick with the ones he approved. For berries, try other fruits with similar colors...example in place of raspberries maybe try red seedless grapes or use pitted cherries in place of strawberries.
Please follow your Dr.'s orders as he knows your specific health history, however you may wish to discuss with him options. Research findings show that some of these foods are ok to consume if they are not a trigger of inflammation for you (the NutriBullet is able to pulverize most nuts and seeds (blackberry and raspberry are the toughest) so that they may be less irritating). Some studies including this one discuss this: http://www.ncbi.nlm.nih.gov/pubmed/21447765
Again, before consuming nuts or seeds, talk w/ your Dr. This is for your information only. Thanks!