Relationships after surgery

I am getting ready for surgery in a few weeks and am wondering how does the weight loss and positive and negative body changes affect the relationship and intimacy. I would hope that by having more energy and feeling healthier, that things would get better but is it possible for things to change negatively? I mean, yes I will be thinner but may have that loose skin and may  not develop self-confidence after surgery. What happens then? Im so scared and nervous. In 4 weeks my life will change forever which is great and I will feel better, but what about body image? Can anyone help?