Hello Friend, Good that you are seeking a help here. Lack of concentration, sleeplessness, body pain, fear, Insecured feelings etc are sign of anxiety and depression. Sometimes bodily condition like weigh gain or loss, appetite, digestion Issues or PMS can also influence such behavior changes in you.
Don't worry. Take a first step by consulting a psychologists in detail and ventilate your emotions and concerns. I am sure with such open discussions you will be able to see a different prepective about yourself and about your problem within suitable solutions.
Next Steps
Feel free to reach out to me f2f or online through Practo for further detailed evaluation and recommendation. Be positive. You will be alright soon.