Hi OP,
I'm sorry that you're in such a confusing situation! I completely agree with the other replies - I wouldn't focus too much on booking halls for next year, especially if you aren't sure if you're going to return to your current university. That way, if you don't return, you're not tied down to anything, and even if you do return and potentially miss out on staying with someone you know, it might push you to try and make new connections. Although your choices will be admittedly be a bit more limited, you should hopefully be able to find a house share relatively last minute with a group who have a spare room going.
As Scotland Yard pointed out, I think it's important to establish what your plans for next year are as soon as possible. If you choose to move university, you'll still need to find accommodation there - and if you don't like halls, you need to decide if you want to rent privately, stay in a house share or find a hall that suits any specific requirements you have. Either way, it's a tough situation, and I hope you manage to figure it out soon.
Eve (Kingston Rep).