What made you to feel so sad dear.
Are you unhappy about something which happened or
Are you unhappy because things are not happening.
I think your mood swings or irritation could be due to that.
Once you come to konanakunte own how to handle your routine a doctor's issues, you might come out of this depressive mood.
Next Steps
For that, do visit a psychologist and share with them and you could get a clarity.