Ok This Problem I Been Have Almost At Week Now

Ok this problem i been have almost at week now you know when you stand up to fast you get nausea and drizzy and sick to your stomach but i can lay and take a nap am ok but when i start moveing around it starts and after i eat it starts and when something cook yhe smell of it make it start also i dont know causeing it and i cant get pregant i have my ovaries i just dont have the part you carry the baby in