Suggest Treatment For Leg Pain In Obese People

Almost everyday I experience leg weakness. I'm 17, 5'6", and I weigh 220 so it might be my weight. Im very worried tho. I have started walking everyday recently but I'm wondering if this leg weakness could be a serious problem. It doesn't last long, maybe 10 seconds at the most. Im mostly worried about it because I'm scared i will fall while holding my son.