I'm surprised that they wouldn't admit you to the hospital overnight after the surgery to put it in, usually that seems standard, so that they can monitor you for some time and make sure it's the right dose. That way if it needs to be adjusted it's easily done in the hospital with a call to the doctor and your vitals can be monitored there as well. I had a pump that was external for 6 weeks, it was a temporary treatment attempt for my RSD, and even then there was no way my doctor would ever let me go home outpatient because it was too risky.

Does your doctor exclusively work out of this outpatient clinic or does he do surgeries at a hospital too?