See we all need energy to stay active to do our work effectively without being fatigued lethargic without lacking interest in them. Since you have been suffering from depression
it is contributing in this situation of yours. Many times there are other unwanted things going in our mind unwanted thoughts and all which consume our energy which we get from food which is limited. You may or may not be aware of these things consuming your energy. Also this is habitual and we develop patterns and our life goes according to these patterns. And most importantly our minset gets changed into a unhealthy mindset and all our thinking beliefs behavior is dependent on our mindset. I strongly recommend you to have psychotherapy
. We have seen many such cases where the productive was hampered to a great extent. Contact me for more information regarding this. Good luck. Take care.