Miserable 😣😥

I am currently 30 weeks pregnant with my third baby. I've had the same obgyn through all of my pregnancies. While pregnant with my first 2 I worked up until a week before birth with my first and up to 37 weeks with my son, I had an office job. Well I quit my job after my second to be a sahm. A year ago I started looking for a job and had a very difficult time finding one so I decided to give housecleaning a try at the company my mom's works at. I clean 4 to 5 houses daily and it's to the point where I'm miserable, I can't move around as easily and by the end of the day I'm so beat and my hands and feet hurt and swell up so bad. I have also been experiencing a lot of lower pressure on my stomach and it's very painful. Had my regular check up last week and told my obgyn all the symptoms I'm experiencing and told him I didn't think I could keep working much longer. He checked me and said that baby and I are in perfect shape and I can work up until full term. He's been such a good doctor to me so I didn't want to question him but I honestly am so done with working. It's getting very tiring and painful to work. Of course I don't want to quit my job but I'm so close to doing it. Either he forgot about my new job or he thinks I'm over doing it. I don't know what to do??