Procrastination - is there a cure?

I am suffering quite badly from procrastination at the moment - there is a fair chunk of work in my office but there always seems to be something to do to avoid tackling it!

I am not sure if this is caused by overwhelm, not knowing where to start, not having the right systems in place, a combination of these factors, or something completely different, but the days seem to be flying by without me actually achieving a lot!

I start something then immediately think of something else I could (or should) be doing; also I spend a lot of time on administration tasks - clearing emails, returning calls, that sort of thing - whilst the work builds up, and that's without even thinking about marketing the practice and the like!

I don't want anyone on here to think bad of me, it's just a problem that I can't seem to shake off - however I do love my job and have a very happy practice and (hopefully) happy clients... but need some anti-procrastination/time management advice... if anyone could offer me some golden nuggets it would be much appreciated.