I am experiencing numbness in my legs and getting tired easily. Kindly help me.

Hello doctor,

I went here because, you know, we are experiencing a pandemic, and I cannot quickly get out nor can tell about this to my parents. I want only to know why I am experiencing numbness in my legs. It is often, even if I only sit or stand, it gets numb. Then I always feel like I need to burp. It is always like there is something that is blocking my air, and I need to let it out. And I always feel tired like sometimes when we have a movie marathon I wanted to sleep already, or I breathe heavily, and the tiredness is happening to me for years as I will walk a little, but I get tired, and when I dance, I cannot finish a song I will get tired. When I tried dancing so much after that song, I run out of breath, and my throat feels so cold. Also, my heart sometimes will feel nervous and back again. I do not know if it is normal, and I am just paranoid, but I have a history of AGN (acute glomerulonephritis) in the kidney. I got it when I was 13, and now I am already 15, turning 16 in one month. I am a female of weight 56 kg and height is 5'4. I just want to know if it is normal. Last month my doctor said I am close to rheumatic heart disease. Kindly give your opinion.