I had a complete knee replacement on May 18th and was prescribed 2 mg if Dilaudid. Of course at the beginning i was taking approx. 4 mg every four hours but have weaned down to 1 and half mg per day over past couple of weeks with stopping all as of a day and half ago. Over last week I have low grade nausea every evening and three nights anxiety attacks as i am having this evening. I have taken .25 mg. of zanex but am still feeling heavy in chest and cannot sleep. Can I do anything else to ease these feelings so I can get some sleep.