Am climbing the walls!!!!!

I'm so unhappy in my pregnancy. I can literally do nothing but clean my house! I'm so bored, literally climbing the walls! My husband is great but he doesn't understand how I feel. We don't have a lot of spare cash to do something nice with, he constantly suggests going for a walk, but I struggle to walk very far at all as I've gained 2 1/2 stone, am now at 29 weeks and feel like an absolute whale. He tells me to relax and watch tv - of which I am a pro anyway - but I can't bring myself to spend my entire weekend slobbing out.
I'm so excited for our future and our baby but I feel trapped in my own body and don't know how to make myself feel better.
I'm surely not the only one?