How long does withdrawal for Dilaudid last?

I was at the hospital for 12 days due to mess ups on current surgeries so they have been giving me dilaudid which is basically a stronger version of morphine. They started leaning me off. I was taking a dose of .8 when I first started and was at .2 but then the last nurse I had gave me dose of .5 which I think is the reason I'm having so much trouble now. I've been home for 2 days now and cant think of anything except for the dilaudid. I'm feeling extremely sick too. How do I fix this, or at least relieve the symptoms? And how long will this last for???