Hi. You need stress management . Go to counsellor. Take the therapy. Remember dont pressure yourself and accumulate Ur work. If u have personal problem talk it out to someone or a psychologist. Your stress can be relieved. Dont worry. Once you do this you will get normal sleep and concentration focus.
Next Steps
meet a psychologist or counsellor.
Health Tips
go walking daily. develop proper eating and sleep patterns. avoid too much thinking. believe u can do any work. admire yourself and your age.