Hi Romona,
You probably have already seen this but there's lots of info here.
http://parathyroid.com/Forgive me, but why can't they remove the adenoma?
As far as losing weight, rather than buy those pre-packaged foods (which, as you say, can be very expensive) you can focus on portion control and low-fat meals, lean protein, add more vegetables and fruit in your diet, and drink more water. Walking each day helps too.