With my first I remember that pushing a trolley would cause terrible braxton hicks so I waited for DH to come home to do groceries. I was working full time but I was in a job where I sat most of the time.

Could you maybe look at asking your boss to get you a high stool so you have something to sit rest on whenever you can? My chiro also suggested tying a scarf under my bump to help support it but you can get special bands from physios too. The scarf helped heaps when I was at home.

Apart from that rest when you can. Most of those things sound normal. Pregnancy can take a huge toll on our bodies, especially if your belly is larger.