Numb/sore legs

Has anyone else experienced leg problems? They’re not cramps! My hamstrings feel torn and weightless, and my knees go numb! I’m 24 weeks, and already gained 20 lbs. I’m a pretty fit and smaller person to begin (pre pregnancy weight was 125). Is it just from all of the weight gain that it’s taking a toll on my body?

I mentioned it to my doctor and he suggested for “cramps” to try calcium, but warned me it could make it worse. So I tried that and it’s done nothing. I’ve also tried “calm” which is meant to help with pains and it did nothing too! I’m drinking plenty of water and eating properly. The pain and discomfort makes me want to puke. And I can’t sit down at work, im up and down on my feet daily and 5-10 minutes rest does nothing.

Any other suggestions? My next appointment is on June 30th, but i don’t know what more my doctor can do...