hi greetings... it s disheartening to know your condition. as you are suffering from problem with your emotions irrelevant thoughts difficulty to concentrate getting irritable at times and feeling fatigue, these might be the part of depression scenario... a person suffering from depression will suffer from anhedonia, Dull mood, decreased appetite, difficulty to concentrate, negative thoughts, ideas of hopelessness ideas of helplessness, sleep disturbance and his patience might have been decreased so that he becomes irritable frequently... Reasons for your suffering might be long standing hypertension and asthma which also causes a person feel low, and so it s important to take antihypertensives regularly and medications to relieve you from asthma as on needed... it s better to consult psychiatrist and take medications to to come out of your suffering and also psychologist to take cognitive behaviour therapy which helps you to gain control over your thoughts,emotions,feelings and behaviour... go for a walk in the morning daily and exercise for 2 to 3 days per week so that your neurotransmitter levels in the brain will be improving... all the best for your future endeavours... hope I solved your query and feel free to ask any further...