What Causes Painful Knots In The Bottom Of Foot With Swelling In Ankles?

Pain when when I put weight on my feet, can feel painful knots running along bottom of both feet, bright red painful blotches on sides of both, both ankles very swollen. Under doctor s care, initial blood work good, additional blood work done to look into uric acid, arthritis, etc. While waiting to hear back from my doctor, I m reading info that might be my situation. Dr prescribed water pill to help with swelling but that has not made a difference. I did fall about 3-4 weeks ago, have no idea if I hurt anything, there was no immediate injury. About a week later start noticing pain when I put weight on feet, from there, swelling and everything I described above. Only mentioning fall - as I did to my dr - just because I don t want to overlook anything that could have contributed to the problem. Very painful and uncomfortable. Thanks girl feedback