i have played skyrim for around 2 hours now and i just have a few questions about the game.

is there any way to quickly switch between spells, weapons and potions on pc such as a hotkey for a potion or a key to change a 2 handed weapon to a healing spell and 1 handed weapon? or is there any way to do this on an xbox controler on the pc?

how long is the main story roughly and after i complete the story can i still do side missions?

depends on what you mean by "quickly." I'm playing the PC version but using the 360 controller, the quickest way I've found is just by adding the things you frequently use to favorites and then all the things you favorite can be listed via a button press. You still have to cycle through and choose though. I do agree a lot of the UI elements in this game are very cumbersome, I love the game but the UI could certainly use some fine tuning. At the very minimum there needs to be an option to quick swap between ranged and melee. I'm gearing my character to be an archer/dual wielder, for the targets I can't drop with a couple shots I'll finish off with melee and right now swapping to melee weapons is a bit clunky.

I suppose it's possible that there is a quick swap feature and I just haven't stumbled upon it but I would think that would be something they should tell you.

oh that helps alot i didnt know about the favrouites thingy thanks. also imo there should be a potion button such as down on the d pad that lets you assign a potion to that or something.

how do i kill a frost troll it jumps down and takes like !?￡ of my heath off every hit and my sttacks take like ten to twenty% of its health

Go into your inventory (default: I) and favorite (default: F) the items you want... two-handed, one-handed, potion, spell, etc. Now exit out of inventory and go into your quick menu (default: Q). Hover over the items and press your number keys, you will see the number pop up beside the quick menu item.

Now you can quickly swap between items without going into a menu.

i got a question aswel. not related to this one...

ok after some hours people start to tell me "hey you look sick" "or you look pale" whats up with that? havend met any vamps that i know of and i got 0 diseases?

If you have the flame breath shout it really helps, otherwise you just gotta swing your weapon wildly until it dies.

Yep, that exactly what happened, soon you'll start to get attacked. You may want to load up a previous save before you get further in