welcome
celexa is a prozac type med and will help a lot if it works for you, this can take up to 6 weeks and at first it often makes your anxiety worse, good idea to continue with benzos for now which doc should have suggested, both go well together
lexapro is basicly the same as celexa, just a more modern and expensive version
also helps to learn new ways of relaxing and coping with the anxuety, called CBT