I was prescribed oralmorph whilst in hospital earlier this year, and it does make you vv drowsy, but I'd have a word with GP/occy therapist re the itching..
http://pain.emedtv.co...-side-effects-p2.html
Specifically,It is common to develop non-allergic itching due to morphine (the active ingredient in Oramorph SR). Morphine causes a release of histamine, resulting in itching unrelated to any allergy. If you develop itching and do not experience any other allergy symptoms, it is unlikely that you are allergic to Oramorph SR. However, you should still tell your healthcare provider, as there are medications available to help relieve the itching.