It seems you are having inattention which may be causing a decrease in your concentration which may be because of worries about many other things that you have in your life. When your mind worries about many things which have piled up and you have not been able to do for sometime may cause lack of motivation.
You need to get your current issues evaluated to know what is happening and is it even up to the level to be diagnosed as an illness.
Next Steps
you can consult with me for further details online.
Health Tips
there are self help books available which may help you resolve the problems that you are suffering through right now. you can try those, but if it does not help then you can consult a professional offline.