Feeling sick end of day

I’ve been up from 6am, went to work, had oats breakfast, no lunch just some crackers and a fruit bar, felt absolutely fine all day, got off, picked my daughter up from school went to the grocery store, went straight to cooking dinner, at the end of cooking I started feeling a lil off, plated everyone’s food, now I’m feeling slightly woozy, stomach ache, a little weakness, a little headache, ate some and decided to lay down as I feel really tired. Not sure if my pressure is high (not hypertensive as far as I know, went to the dentist a few weeks ago and it was 130/82 which I know is above normal) or it’s because I didn’t eat or if I’m just tired.