It doesn't sound unreasonable to me given the severity of your symptoms. But I'm not a sleep doctor.

Consider also that there are other ways to procure drugs like this, i.e., shady online vendors from overseas. Just make sure you do your research on the vendors first. There are people who have ordered various drugs from these vendors, chemically verified that the drugs were in fact what they were advertised to be, and then posted their results in various places online for the benefit of others. Bottom line: some companies are more trustworthy than others--do your homework. And obviously you should exercise due caution when taking a new drug without a doctor's consent.