36+3 and I can hardly walk...please tell me i'm not the only one...

Between the weight of the baby (he was over 7.5lbs at my ultrasound a week ago), round ligament pain, and back pain I am having SERIOUS issues walking. Even walking to the bathroom is excruciating. I get this stabbing pain in my left side doctor says is round ligament, but I don't know. The pain is severe. My legs don't seem to want to work....I've already missed 2 days at work this week because I can hardly move without pain...anyone else?