Well, take note of what Sirus has been doing when he comes across groups of monsters: He lures them into as narrow a corridor as possible so he only has to fight a few of them at once in melee. He uses his abilities to the maximum effect and he probably makes sure to eat food when about 1/2 health and runs away for a bit to let the regen do it's thing.
Never be afraid to run away for awhile. You should try to know your limits where possible, and if you are coming across things that are too much for you, use an item to help even the odds or attack from range.
Another problem is your skill choice. They don't all support each other in some way, or work well with each other. Take for example your typical melee choices: Axes (or some kind of weapon skill), Bezerker Rage, Master of Arms. These work well together because they focus on melee and increase stats that are important for melee. But then you've chosen Viking Wizardry and Promethean Magic, which are magic skills. These skills are useful and powerful when leveled, definately, but they have no support! Spells cost mana remember, and without skills to help increase the stats that are responsible for spellcasting as well as possibly your mana regen, they are useless since you will never be able to use them when you need them. Get rid of them if you are going for a melee build!
I see that you have also taken Artful Dodger and Perception as skills, which isn't really that big a deal but if you are going the heavy armor route, then why take Artful Dodger when your armor decreases your dodging chance? Perception can stay, but make sure you level more important skills first, like your attacking skills, or a crafting skill.
Why don't you try taking some kind of crafting skill? There are all those useful crafting materials that you just have to leave behind and not use to your advantage if you don't take one! With a melee build, smithing will give you armor, weapons, shields and also make you more effective in melee when leveled, but really all the crafting skills have their upsides for almost any build.
If you are taking magic based skills, then make sure you take proper supporting skills! You don't need them all, but two of them realy help. My favourites are Blood Magic and something else, probably the one where your a student of magic (I forget the name). Don't be afraid to take magic skills, Promethean Magic is really powerful and useful if used right as are other magic skills, but make sure you can use such skills regularly!
Also, if you die, remember how you died and what you might have been able to do differently. If you are equipped poorly, then DON'T open the chest of evil! It's not going anywhere, you can just come back later when you are better prepared. Monster Zoo's are a problem, definately, but if you funnel the whole lot of them through a narrow chokepoint, then their numbers mean little. Also, feel free to use your items (healing potions, special bolts, bombs and thrown items, etc.) to your advantage here!
If you are repeatedly getting killed easily with a certain build of skills, perhaps you should try something different? Getting maimed on a melee based build? Try a magic build with Promethean Magic, some other magic attacking skill or two and a few support skills for them. Getting pwned with your magic build? How about a stealthy, range weapon using build with critical hits or special abilities from assassination, dead eye or other interesting skills? Mix it up dude and don't be afraid to experiment!
And most importantly, take your time and enjoy the game!