My Feet Legs And Now Even My Face Are Swelling!

My feet legs and now even my face are swelling! I have gained 14 lbs in 7 days. I was just released from the hospital last Tuesday where I was admitted with low blood pressure of 90 over 60 low potassium almost non working kidneys dehydration and more. I was diagnosed with a viral infection that just attacked my system. I usually have high blood pressure so while in the hospital I was taken off bentacar. I am also having headaches! I am really concerned and would like to know if I should go to emergency room or wait to see doctor in an.