And it is pretty fast, try to look for the place where you choose the OCI client, just write OCI in the field. And similarly, if you think you wrote some smart code a few days ago, just search for it in the SQL history:
If you can't find it, it is because you have forgotten to increase Days to keep history from 7 which seems to be default. Go back to preferences and crank it up. 30 days, why not?