He didn't tell me!

My doctor put me in Metformin about a month ago and didn't tell me that it could affect my blood sugar so much or anything! He told me nothing, not to watch out for anything he just told me if I don't start my period in 3 months to come back. Now I might have to go to the hospital because my blood pressure and blood sugar is so messed up. I'm so mad.

*Added*

He told me it was to bring down my insulin level and help with that to kick my period back on, but he didn't tell me anything besides that. He told me nothing about the drug besides that it would go in and help bring my insulin levels down.