Weird symptoms and need advice

Bree • Serving our country, loving God, cherishing people and being present in each moment
I'm 26 weeks and this week have experienced a lot of dizziness. It especially occurres after driving wether it's me driving or someone else. I've been getting nauseous , dizzy, sweats and feel really over heated. 
I haven't felt any of this for months and really have felt great. I really am not hungry which isn't normal for me. 
Should I be concerned? Or does anyone have any advice.  I put a call into my doctor but haven't heard back yet.....