Hi.. possible Reason is here ADHD along with anxiety also may be there sometimes , you should regular exercise, play focus  enhancing games , try to remember daily about your past lunch or dinner that what did u take in last few days , gradually once u make efforts towards strengthen ur memory it will but u should make effort for it , along with that u can take medicine for ADHD

Hello I think concentration is affecting.. only these you can resolve.. but you need mood n sleep r affecting r not.i think only lack of concentration you can start with physical activity n social support..but given information is not suitable for evaluation