What Causes Rapid Weight Loss?

I have been concerned about my rapid weight loss. Just one in a half mnths. ago I was 130 pnds, I am now 104. Also my body aches all of the time. I have a hard time smelling and finishing a full meal. It comes with dizzeness, nausea, headaches, cold hands & feet. My major concern is Diabeties, even though I was tested about two mnths ago and it was neg. I have a long family history of it. My Father, grandfather, and an aunt all on his side have died from it in the past 24 yrs. Sometimes when I try and eat the smell makes me run to the bathroom and dry heave.