Babs, I'm by no means an expert, but some people do suffer adverse effects after a Nissen and in some cases the wrap has to be loosened a bit, or the esophagus needs to be stretched. Other people also complain about a 'bloating syndrom' that occurs after the fundoplication in some individuals. Have you been back to your doc? That is really your best option.
Need help ASAP. Cant go on much longer like this.