While trying to help the people of morthal i was sent to eldersblood peak to fight a dragon... But upon arrival the dragon started to have what looked like an epileptic fit, i havnt been able to defeat the dragon or even harm it even useing the dragonrend shout doesnt work. neither does saving, restarting and sleeping! How to fix this please!

I bought proudspire manor in solitude for 25k and purchased all decorations. But every time i mount armor onto my mannequin, the mannequin dissapeares when i leave the house to see if it storts itself out, it doesn't so i thought getting all my armors off it will work, doing this it had douped my armor and everytime i try putting new armors on it repeats and removes the gear i put on it, and equips the "Douped armor"
my bookcase is also bugged along with my wall mounts, weapon rack and my herbs hanging in my house, i dont have a previous save so i cannot reload to an earler date.
If anyone else has had this problem and has able to fix it, any help is appriciated