I'm also a working mother and do understand it would really be exhausted if a small kid is drawing attention all the time from mother. Of course I do enjoy the time but I think there should also be room for relax.
You may perhaps make some arrangements like going to park where your kid can play with other kids. In fact some green grass areas are safe and the kid can run about and you may relax or may even enjoy a cup of tea.
Even at home your husband may as well play a part like reading and playing with your kid. Taking turns to look after your child may also help.
Another option is to join some of your friends/relatives families which also have young kids so the kids can play together and the adults can still chat while keeping an eye on the kids.
Take it easy. If you are not happy try to put down your things and relax a while. Let your child knows mama is very tired.