I just can’t seem to lose weight no matter what...

Seriously no matter what I do I am not losing weight. I have a new job that is physically strenuous, a lot of walking, lifting, pushing, climbing and I can feel my muscles getting stronger. I haven’t been hungry, I’m almost more nauseous all the time, but I’m not pregnant. The nauseous feeling has been off and on for the past probably 2 months. When I do eat I don’t eat a whole lot... i want to lose weight to feel better about myself and be healthy but I can’t lose anything!