I need help, I'm scared of descending, not bothered about going up hill but do not like coming back down.
Any advice?
First of all, a successful descent is defined as: "I got to the bottom without crashing".
That's not to say you can't get better at it than you are now.
Marmion has already given the number 1 piece of advice. Look where you want to go and the bike will follow. As you approach a bend, start analysing it as soon as you can. Wet or dry?.... What's the surface like?... Any gravel?... How tight is it?.. Any obstructions?.. Is it blind or can you see the other side?
After you've decided that, you can pick your braking point so that you can slow to the speed that you are comfortable to take the corner at. Just before you get on the brakes, you should be looking at the line you want to take into the turn. As you turn the bike in, you should be looking at the line you want to take to exit the turn, and then down the road after the exit.
That technique ensures you are always looking ahead of yourself and won't get taken by surprise by a pothole you've just seen too late. If you want to descend faster, you need to get to know the descent well. ie. where the potholes are, dodgy surfaces, where there is likely to be gravel etc. You can even practice it driving a car at every corner you take.
DO NOT try to take corners faster than you are comfortable, there are no prizes for crashing off a corner and breaking yourself. As you practice, your comfortable speed will probably increase a bit, but be careful of over-confidence.