Hungry, but no appetite for weeks now... is it in my head?

I have had a very poor appetite for a few weeks now. Nothing sounds or tastes good to me, not even my favorite foods. Up until a few days ago it was just a general lack of appetite, nothing was appealing and I was forgetting to eat. The last 2 days I’ve felt nauseous when I think about eating. I actually ended up throwing away a whole salad and the majority of a sandwich yesterday – and that was all I’d had. I really thought I was going to be sick.

Well now my stomach is growling, since it’s 4pm and I haven’t eaten yet, but I can’t find a single thing in my fridge or pantry that isn’t making my stomach do flip flops.

I’ve been under some stress lately, could that be causing this? I also posted that I’ve been having trouble sleeping for the same length of time, they seem to have come on hand in hand.

I’m not pregnant.