Certainly I can relate too. The sheer awfulness, the sick-to-the-bone feeling of being so hungover, yes.
But you most definitely can make it the last time you feel like this.
Stay strong and committed to quitting. Use your visit to the therapist to bolster your commitment. You can do that by coming absolutely clean with your therapist and enlisting her or him as your ally in your fight against this. My visit to my doctor on Day 1 was my line in the sand. I gave up, figuratively, and owned up to my true alcoholic ways. Scary but liberating. It was a first step to freedom.