Oh... You're a Witch Doctor... I'm sorry.
WDs are broken. It's not you, man, it's the game. I've literally seen 1 WD in my travels through Act 3 and 4. He was in Act 4. He was wearing some odd gear from what I remember, and he died a few times and left. Never seen one since.
I think the problem is that with WDs and especially with bears you need to be pretty close to the fray, and you've only got one good escape/defense tool. DHs and Wiz have a few more, and they don't have to be that close. With most other classes your resists, LOH, and HP would be pretty much insane, but without the melee damage reduction, and without some of the tools the other classes have I'm just not sure what to recommend to you. My own WD got slammed into a wall mid Act 2-ish where I really found that bears stops being as good. I was able to sail through Act 1 easily with it, but after that you just can't be that close to monsters unless you've got a ton of damage mitigation skills. Not just equipment, but skills and passives too, and WDs just don't have them.