i had a Bladder infection & I hurt so bad all over & everyday it is getting worse, it is in my joints & sometimes it is even hard for me to walk. Before I started taking Cephalexin 500 MG 3 times a day for 10 days. Right away after 2 days I stomach started bothering me, I was tired & I was napping in the morning & afternoon because I didn t feel like doing anything. THe I got diarrhea & the light came on in my head so I cut back to one in the morning & one at bedtime. I was some better except for the joint pain & it was only today I thought I bet anything it is the meds. I will call my doctor in the morning but should I discontinue to use it. I only have tonight & tomorrow to take it but the hurting is almost unbearable