Feeling unwell... not sure if I should go to the ER

Yesterday and today I was feeling lightheaded, and dizzy, and abnormally tired--- no energy, accompanied with nausea. I also felt shaky without shaking.

Around 8pm I called the after hours number at my Dr's office, and they called me back and told me to eat and stay hydrated. The thing is, I wasnt feeling hungry at all, and I've been well hydrated. Still, I stank a vitamin water and DH made me eat pasta.

I woke up at 2 am with the same shaky feeling and nausea & dizziness. Anyone else felt like this before???