Hello and welcome to Beyond Blue. As I read your post I thought what a lonely life you have and I am sad for you. Writing in here is a great first step to a new life and it shows you have courage to face the future. Reinventing yourself is hard work but you know you can do this as shown by your weight loss. I know several people who have had this surgery and I know they struggled with the life changes necessary. Shows your courage.
I agree with Mark that a visit to your GP is the next step. You sound depressed and getting this attended to will help your motivation and your energy. While you are attending to this, have you thought about further study? What does your local TAFE or university offer? What interests you? I have always been interested in communication so at age 48 I enrolled in a degree course, part time. This brought me into contact with many other people, some fresh from school, others older students like me.
Part time study was necessary as I had a full time job. It took me five years to complete the degree and I loved the whole adventure. I did not have the requisite qualifications to enrol so have to sit an exam for mature age student entry. What a giggle.
If you are saying "I can't do this", then do some other study. I did two senior subjects at TAFE which gave me the confidence to try uni. Look around your neighbourhood and see if anyone wants voluntary help in an area that interests you. I know one of our champs volunteers at a horse riding school for people with disabilities. Ask at your local animal shelter, Op Shop, primary school if the hours fit in with your work, check out the local churches and see what they offer.
It's all about you finding something that appeals to you, something that gives you a reason to get out of bed in the morning. And from my own experience of depression, I know how hard that is some mornings. The same desire to crawl into bed as soon as you get home. It represents safety and that's what we want. We want warmth, comfort and security. It seems when we are most depressed that these are the last things available to us.
Even being mildly depressed can cause us to lose our 'go power', takes away our enjoyment of the activities we once loved. I know. As usual I am exceeding my character limit. Please continue to write in.