Overthinking. I keep forgetting things!

I am able to understand what u must b going through. Many of the symptoms which u have mentioned is seen in people with depression and anxiety. Depression makes a person sensitive and irritable to things which they were able to tolerate before and lead to interpersonal problems. People try to improve their mood by  eating more, sleeping more etc, but with no effect. V need to evaluate whether depression is the reason behind ur difficulty in studying. V would need to know few more details like ur sleep, hunger, energy levels, interest and the stress that is causing these difficulties to give appropriate suggestions. Depression reduces the concentration, motivation and interest in a person. Ur problems can easily be treated with counselling and if needed medications. Don't let ur problems affect ur personal or family life. U need to have a Psychiatrist evaluation. U can also consult me online directly through the practo chat option. Best wishes for speedy recovery!!