Thank you for asking. I can understand your distress. Suicidal thoughts and mood swings could be an indication of an underlying mood disorder. If you are also having an issues of low mood irritability, sleep problem, anger issues, it is further supportive to an underlying mood problem possibility. Although, to make an accurate diagnosis and plan a definitive management you must consult in detail with a psychiatrist. It is important on your part to understand that mood disorders can happen to anyone. Although, stress happens to aggravate these problems, but in many cases there could not be specific cause seen. Like any other medical problem e.g diabetes, hypertension, Thyroid issues, etc mood disorders must also be treated. With suitable instructions and if required, with medications it can be completely cured. Considering all this, I would strongly suggest you to consult with a psychiatrist soon. You must visit him.

There could be many reasons for the symptoms for which consulting a Psychiatrist would help

Loss of interest, decreased concentration and attention, feeling low and disturbed sleep or appetite are some of the signs of depression. Consult a psychiatrist who will assess you in detail. If you are feeling suicidal or hopeless, seek professional help immediately.