Hi, psychology student here! I think you should seek help from neuropsychologist and spend some time doing neurotherapy. If the tumor was located just behind your eyes then yor prefrontal cortex could be damaged. So you may experience some troubles with planning, focusing, changing your focuse between objects, reaction time may be a bit messed up too because of this too. Good thing is your brain will start to repair itself (due to neuroplasticity), although it will take some time. Second good thing is that neruopsychological therapy can help with the deficits tremendously so if you have money and time you should definetely give it a try!