I’m sorry that you are having such a tough time. Fortunately, you are most likely cured and what you are going through is normal, and will improve in the next few weeks. It is actually not that uncommon to feel worse in the first week or two after surgery, as your body adjusts to the new hormone and calcium levels. Think about it: your body had years to adjust to having parathyroid disease, with higher PTH and calcium levels - and then in one day all of that changes, the PTH and calcium plummet. Your body doesn’t like big changes like that, and needs time to adjust. Some people feel this more than others, and they end up feeling worse in the week or two after surgery. This seems to be more common in people who have had parathyroid tumors for a long time. 

Go easy on your body - it’s having to adjust to a big shock. As your hormone and calcium levels settle down, you should start to feel better.