Unlike you, I have suffered this all my life and now approaching 70 it is getting worse. The only way I get help is by clearing my mind completely by doing something completely different and going out walking to the shop if possible. Coming back in and standing still as bebnobs suggest does help. Unfortunately, I cannot comment on cambus idea as I can never remember where I last saw it.
In this situation, I am always reminded of a letter I read, where Mum ALWAYS cleaned her sons shoes ready for school next day. One morning they were not there even after searching everywhere possible. Thoroughly exhausted after sending him to school in sandals she went to have a cup of tea ---- and there in the fridge were the shoes! I try just to think of the ludicrous and then usually find what I want.