Excluding the few "real" aces who depress and impress the rest of us mortals, what you experienced is quite normal in the situation where you are out of practice.
In the short term, you can only control your immediate workload as necessary to keep yourself ahead of the aircraft. This might dictate a hold, a reduction in IAS, an earlier descent, more work in the preflight documentation planning ... whatever it takes to unload yourself.
In the longer term, get the practice however you can organise .. and the problem reduces. PC sims can help, link trainer is wonderful, full flight sims are near enough to the real thing and, of course, you can always spend some money and do a bit more flying. There is no easy way out of the problem for most of us ...
It doesn't go away ... it just reduces in severity. It is always there, lurking in the background ... you just need to mismanage a flight's progress sufficiently and let yourself get overloaded to enjoy it ...
[This message has been edited by john_tullamarine (edited 05 July 2001).]