Loss of appetite

So i lost my appetite out of no where and it’s been almost a whole week. I’ve been having to force myself to eat one meal a day and every time I do I feel really nauseous. Sometimes when I start my period I lose my appetite for a day but my period ended a day ago and as I said it’s been almost a whole week. I feel really tired and I just don’t feel hungry at all. Last night after I forced myself to eat a sandwich I was dry heaving and almost threw it up. I took a shower and I felt better but the next morning I felt unwell again. Does anyone have any food recommendations, medicine, or have experienced anything like this?