These symptoms may be due to depression or anxiety or over mental pressure.
Some physical cause also there like Hypothyroidism.
Some blood test needed FT4,
TSH to rule out Hypothyroidism.
To improve concentration u must focus on ur study, passion, work etc.
Accept reality that after doing proper education u got a proper career. But out of focus causes lack of concentration and education.
Next Steps
Consult psychologist online immediately and learn how to deal worse situations in life and how to improve ur concentration.
Take Amway Iron Tablet regular 1 after lunch for 3 monthd.
feel free to contact...