I'm a battle necromancer, one problem I have is when I summon creatures with conjuration, they sometimes get in the way of battle and I accidentally swing a hit at them, and they disappear.. this usually leads to me having to summon it multiple times during a battle, which leads me to death. Is there any way around this?

The only way is to not hit them. Unless you use magic. Then just use the same element of the creature since they have an immunity to it.

That's because you're probably using a summoned blade (like me) and have the Oblivion Binding? perk to banish summoned creatures to Oblivion. You can undo the perk with the following console command; player.removeperk -perk ID here-
If not, then you can use normal weapons or just be careful. If this happens with normal weapons, it just means you're boss.

Switch to 3rd Person View for Battles, it is the only way I can keep from hitting my followers.

Yeah. Dont hit it. It really isnt that hard...

Take your time to aim and position yourself properly.

They are just like followers in that they get in the way. I like having to be careful.

If it wasnt for stuff like that the game would be no challenge!
:-)