Sorry to be slow responding.
Since you mention the hurricane I am going to assume you are in the Eastern US and so not at altitude. The symptoms you mention sound just like those you might have on Day 2 at altitude.
Heat will have a similar effect. Your perceived exertion will be much higher and this will be exacerbated by added weight. The capillaries in your skin dilate to dump heat. This increases blood flow to the skin and means less blood/O2 for the working muscles. HR goes up, respiration goes up and effort goes up.