Sickness affecting relationship with parents. Advice?

So, at random guess, I'd say about six months ago, I began to have constant nausea and lightheadedness. We (my parents and I) made a couple visits to our family doctor. He thought the symptoms may be caused by stress, so he taught me a couple exercises which he thought could help. I tried them and they didn't help. Went back to Dr. J, who put me on some samples of Protonix, and sent me to get some blood work done. The blood work showed nothing out of the ordinary, besides a small touch of dehydration. The protonix worked for a little while, then stopped altogether, and I was getting no relief with my constant nausea. Over the next few months, my meds were switched from Protonix to Omeprazole, from Omeprazole back to protonix, from protonix to Ranitidine, from Ranitidine back to Protonix. Nothing is giving me any relief from the constant nausea. I've tried everything from exercises to drinking nothing but ginger ale. The stress from me being sick is really.....