Can this just be stress or something much more?

Me and my fiancee of a year and a half have just recently split up. Since then iv been very nauseated especially after eating and i havent been able to sleep very much due to getting up due to nausea. Also iv been having minor spotting and cramps. Can these symptoms be signs of stress or is it something i need to get checked out. I have taken a pregnancy test and it was negative.