Just feel gross all the time

This is my second pregnancy and it's really taking its toll on me. I have a 16 month old to keep up with and I knew I would be tired, I was with him too, but I just feel horrible. I'm tired and I just feel gross. Everything I eat makes me feel sick but I never actually get sick, I just feel bloated and gross for hours after I eat. I thought it was the fast food but I've been cooking homemade meals and eating fruits and drinking water and I still feel bad. And I have constant headaches. Does anyone else feel like this? Any tips for the headaches?