My 6 year old son has been sick with the flu off and on for a few months with daily headaches as well. He has a fever off and on as well. I have been switching with Motrin and Tylenol. He also couldn t walk for 4 days he was crawling around and would walk around on his tippy toes but would fall. He couldn t walk flat on his feet he complained of pain and when I tried to make him stand he just fell. I took him to the walk-in clinic on a wednesday and the doc said if he wasn t walking by friday to take him to the ER or back to the walk-in. So friday comes and he still couldnt walk so i took him in and they did blood tests xrays and a urine test...She said his liver was a little low on the count or something and his white blood cell count was a little low but due to him having the flu that could be why too so I guess I just want a second opinion on what you may think could be goin on....Thanks