Hi. So My Sister Just Had A Fever And Was

Hi. So my sister just had a fever and was puking and then she started to have symptoms like a cold. The doctor said she had Strep Throat. That was a couple days ago and she seems to be better. Now I have a stuffy nose/runny nose, had a sore throat for the first two days, have mucus in my throat, feel tired, my stool is yellow and liquidy and I have trouble pooping, I have stomach aches like I have to use the bathroom but then I cant go, a light headache, and warm skin (dont have a fever)