Here are a few suggestions to help you respond and not react:

1. Don't take it personally. Understand that the feedback is directed towards your work and not at you. Try to remain objective and detach your personal self from your written work.

2. Learn to trust. Learning to trust can be a lifelong journey for some. However, try to understand that your supervisor, an experienced prolific scholar, wants you to succeed. Your success also reflects well on your supervisor so it is a win win for both parties.

3. Sit with the feedback for some time. Instead of acting on your emotions right away, let the feelings sit in your body. Let the feedback simmer. Acknowledge your emotions, do not deny them. Give it time. Come back to it after some time when you feel more open and relaxed. Now, try absorbing the feedback again with a renewed perspective.

4. Respond and not react. Start with the positives rather than the negatives. Go over the positive feedback first or simply appreciate the new direction you have been gifted. This is progress. Your supervisor has most probably pointed out something which will help your final dissertation get approved/published easily. Respond to the feedback rationally rather than emotionally.

5. Be patient. As you progress in your doctoral journey, your writing and your grasp over your field will get better. This means reduced critical feedback from your supervsior. You might even understand your supervisor's feedback style with time and learn to respond better so give it time.

6. Ask for advice. Don't hestitate to ask for advice from your peers or friends and family. Try to connect with another one of your supervisor's supervisee and ask them how they handle feedback. If they are willing, share your specific queries regarding your supervisor's feedback and discuss the next steps. You may also share your supervisor's feedback with another faculty member from your committee and get their perspective.

7. Develop a contingency plan. Try mitigating the stress by sharing a rough draft of your final writing with your supervisor first. After they have given you their feedback, then start writing the final draft so that you are both on the same page from the start.

8. Take some time off before revisions. Usually when doctoral students submit a draft of writing, they are exhausted and drained. The thought of immediately starting on revisions can be daunting. Therefore, take some time off before you start working on your writing again.