Hi thanks for posting your query.As you have mentioned symptoms like heaviness in head,hotness in the eyes , feeling sleepy .All these symptoms are due to faulty diet and lifestyle which impairs digestion leading to ama formation in manovahi strotras causing heaviness in head.Here i am giving you effective remedies for the same 
Diet
Have more alkaline and less acidic diet
Consume food having cooling effect on body like amla 
aloe vera , coconut, mint, coriander
Avoid processed, junk, spicy food
Do 
yoga, pranayam , 
meditation daily
Anulom vilom, bhastrika, bhramri, shavasan, yoga nidra are effective
Nasya and 
Shirodhara therapies are recommended
Try ayurvedic medicines like sutshekhar ras 
pathyadi kwath mukta praval pishti
Go for a walk daily.
As you have mentioned that there is a problem of concentration so practise meditation daily .
Hope this answer is useful to you
Best wishes
Take care
Regards
Dr.Pallavi