Going to europe in two weeks. Can I get treatment there for opiate withdrawal?

Opioid withdrawal. Yes you probably could get treatment in Europe, the issue will be the coverage. Your insurance may deny it because there are MD's that can do this in the USA. Also remember that the treatment is done over several weeks unless you do an in-patient rapid detox.
Yes. Suboxone is widely avalable worldwide- was previously known as temgesic there.