Did you have Opera Classic or the Opera Mobile version that Opera Classic is the same as (version 12.x)? I had both, along with the latest beta (Opera 16, I believe) on my phone. The newer versions of Opera would not overwrite Opera Classic, but they will overwrite Opera Mobile 12 and lower. It might not be much of a solution, but you can install Opera Classic and set everything up again.
Opera 18 does have a reload/refresh button, at the far right end of the address bar. It's an X while the page is loading.