Edema, and sweating after eating
 

A while ago my doc told me that my kidney function seemed to have gone down a little. ....but not to worry as it was still fine. I didn't think too much of that.
We have had lots of other health issues with my husband so I have put myself to the bottom of the pile as usual. Now I notice I have slight pitting edema in my lower legs, and this last week or so I have noticed I get very hot and sweaty after I eat anything.... I haven't been to the gp yet, but am i right when I think that this could be kidney related yes?
I also have an under active thyroid but am not diabetic nor do I have high blood pressure....that I'm aware of.
I will make an appmnt with the gp as soon as I can now, anything I should know or what shoukd i ask him to do.?....I don't want to be fobbed off.
Thankyou