I wasn't sure where to post this, so I am putting it here. This is my first post, and I came here because I tried to find something on the internet about this but nothing too specific came up. I also already tried posting on yahoo answers and didn't get much information. I am a 30 year old female. I am a moderate smoker, social drinker, and I am obese. I am not currently taking any medication except for allergy pills, which I have been on for a long time. Last night, I woke up and wanted a drink of water. I stood up with no problem, stepped forward with my right foot, and my leg just seemed to give out on me and I fell forward on to my knees. I remained on my knees for a few seconds, shocked because I have never fallen before without tripping on something. I tried to stand up, right foot first to test if I could bare weight on it, and was able to get to my feet easily and walked to the kitchen like nothing happened. I am in fairly decent health for the most part, aside from what I already mentioned. I did injure my back about 5 years ago. It was a work comp case, and I don't think it was handled properly. I was diagnosed with a lumbar strain and no imaging was done aside from an Xray which was negative. I underwent 6 months of pretty intensive physical therapy so I could return to my highly physical job (I walk several miles a day, lift 30+ pounds repetitively, and push and pull several times that repetitively as well). I have experienced some sciatic pain but it's very infrequent. Aside from that, I have had no debilitating symptoms post therapy and return to work. In the past few weeks, the area I previously injured has been spasming. It usually happens when I am sitting down and bend or reach. I do get numbness in my feet, but my last general practitioner attributed that to stress which aggravated my Generalized Anxiety Disorder. Just curious what some of you might think about my situation based on this information. I'm relatively sure I need an MRI and I'm thinking there might be some nerve damage at work here but before I freak out about it, I'm wondering if anyone thinks it might be something else or has some idea I haven't contemplated. Thanks!