Obviously- it does sound almost excessive, but it did work and you said that there is nothing online about relative contraindications (using the two simultaneously).

A doctor would know for certain whether or not you should do the two together. A pharmacist advised against it, so that is a little concerning.

Speak to your doctor, because perhaps a different Z-drug or even an atypical antipsychotic like Seroquel may help. I used to use Ivedal, but the effects eventually grew weak.

EDIT: Also, there would obviously be things that work. If one took more sleeping pills than prescribed, it would likely work. Like using Valium and Ativan together because the two simultaneously would definitely work. Now that I think about it, two hypnotics together is... shaky.
It is similar to using a higher dosage of a hypnotic. Taking 20 mg instead of the prescribed 10, etc.

I know... I don't really wanna sound like I am lecturing or that I am a know it all. I just know what happens. You take more, or a mixture and sleep well but you are sedated in the morning because, well, the drug's effect has increased, perhaps doubled.