diazapam

Yes its amazing but true that Valium, an anti-anxiety drug can actually cause or worsen anxiety in some people. Some of the possible side effects for Valium include 'agitation, anxiety, hostility and hyperactivity'; not quite what you'd expect from a drug designed to calm you down. Valium isn't alone in this; anti-migraine medications can make some people's headaches worse and anti-depressants can utterly depress other people. The central nervous system is a very complicated place! I hope you can find something more soothing.

http://www.healthcentral.com/anxiety/valium.html

if you get anxious from a down like valium, maybe you are ADHD?  Check it out!