Complaints You Mentioned Above Include 
[1] 
Sleeplessness (Unable To Sleep)
[2] Forgetfulness (Difficult To Remembering All)
[3] Decreased Concentration (I Cnt Able To Undrstnd Quickly Wht Other Sayng Infornt Of Othes)
[4] Decreased Attention (Carelessness)
[5] Indecisiveness (Difficult 2 Take Decision)
Well, All These Can Be Early Manifestation Of 
Depression Or Acute 
Anxiety Or Something Else. But I Am Not Sure As You Have Not Mentioned All The Prime Criteria Laid In Diagnostic Manuals For Labelling A Person To Be Suffering From A Particular Psychiatric Illness. For Your Self Evaluation You Should Know The Diagnostic Criteria Of Depression (DSM IV) …..
Criteria For Major Depressive Episode
[A] 5 Or More Of The Following Symptoms For At Least 2-week Period; At Least 1 Of The Symptoms Is 
      Either  Depressed Mood Or  Loss Of Interest Or Pleasure. 
      (1) Depressed Mood , Feels Sad Or Empty, Appears Tearful As Reported By Other
      (2) Markedly Diminished Interest  Or Pleasure
      (3) Significant 
Weight Loss  Or Weight Gain
      (4) 
Insomnia Or Hypersomnia
      (5) 
Psychomotor Agitation Or Retardation
      (6) Fatigue
       (7) Feelings Of Worthlessness Or Guilt
       (8) Diminished Ability To Think Or Concentrate, Or Indecisiveness
       (9) Recurrent Thoughts Of Death , Suicidal Ideation
[B]  Exclude Mixed Episode
[C]  Significant Distress Or Impairment In Social, Occupational Functioning 
[D]  Exclude A Drug Of Abuse, A Medication Or A General Medical Condition
[E]   Exclude Bereavement
After Going Through The Above Criterion, If You Think  The Most Of The Symptoms Mentioned ,Are Your Own, You Need An Early Evaluation By A Mental Health Expert In Your Locale & Proper Treatment With An Antidepressant…
Thank You.