You choose how you experience your dissertation process. Only you. What this means? That you decide if you are suffering through it, or whether you are enjoying your way through it. You decide if you feel anxious and overwhelmed, or not. You get to choose. And, at any time, you can choose something else.
That goes for how you feel, what you work on, where you spend your time, and whether you choose to keep working on the dissertation or not. Remembering that this is a choice will lessen your resistance to taking action and getting done.