HI I Have Been Taking Zohydro ER For 3 Weeks

HI I have been taking Zohydro ER for 3 weeks now, and I have been feeling tired, no energy, short term memory issues, at night when sleeping I itch like crazy. Is this typical side effects of this mediation? I have called my doctor and explained these problems but was told continue taking as prescribed and they will see me again in a week and a half.