I was prescribed 2mg diazepam for muscle spasm in my lower back. I had to take 3 a day as well as co-codamol. They definitely knocked me out but I think that was the combination. I have taken the diazepam on its own from time to time and it's lovely - just chills you out. (I take citalopram for anxiety too at the minute). I'd have a go with one but just be aware you might be drowsy so perhaps try one a couple of hours before you have to go to bed?