Is this good enough cause to see a doctor?

[Ellyse]

For quite a few years now my mother has been complaining of getting the shakes and feeling weak when she needs to eat something, this only happens occasionally and always goes away after she has eaten. Is this cause for concern and should she see a doctor. To me this sounds like she has a glucose problem but I am not a doctor and I do worry about her. Noone in our family is diabetic but that does not mean she can't get it. she also has poor circulation and is constantly complaining of swollen feet. I know diabetics can have problems with circulation too or could this just be caused from her varicose veins? Sorry for so many questions I really appreciate your answers. Thanks guys