I'm pre-op. I see a therapist. I have been seeing her before I ever imagined getting surgery.
She urged me to continue therapy. She warned me not to get surgery if I was planning on discontinuing therapy. food has been a outlet for all of us. When you're obese food is usually more than an outlet for overwhelming negative feelings, it's an outlet for every feeling. My therapist and primary care doctor have both told me that when you remove food from the equation you can really start to grapple with life, because you no longer have your coping mechanism.
I highly recommend talking to a therapist. Most healthcare providers allow a certian amount of visits monthly. They can help you work through your new lifestyle.
There is no going back, but you may find solace if you look into research about patients three years out. Your stomach begins to grow out again and you can have a similar lifestyle to pre-op. (Hopefully by then we have all learned healthy eating and don't need to be resleeved.)
Good Luck