45 mg of a benzodiazepine- okay dosage to take or too much?

No, it's not. First, you are not taking a sleeping pill. Benzodiazepines are to treat anxiety, primarily and you should speak with you physician about a more effective and appropriate medication, such as Ambien. Second, you are SIGNIFICANTLY increasing the dose by going from 30 to 45 m. Third, you are now getting into high drug doses that can be problematic (i.e., overdose). Fourth, if you are having trouble sleeping tonight, I suggest taking a warm shower for 15 minutes (I'd suggest a bath but with 45 mg of BZ you could end up slipping or drowning!). The heat will relax your muscles, open your lungs and relax you. Then, have something warm to drink and read a book in bed. That will help until you call your physician TOMORROW. Be smart about this and don't self medicate.