Addicted or not? (Drug question)

I have had chronic leg pain for about two years now and I usually pop a few (and by a few I mean three or four) Vicoden, Percocet or whatever seems to make the pain go away.

Since I’ve ran out of it I’ve been feeling way worse. Sweats, headaches, loss of energy, insomnia and feeling like I’m going to throw up.

Have I become addicted or is the pain from something else?

If I am addicted then how can I ease this process of detoxing?