Feelings of low mood and potentially sliding into depression are not to be surprised at after what you have been through/are going through. I am sure I would feel similar, to be honest. What is good is acknowledging how you feel and potentially getting some understanding why.
I know I become less sociable and tolerant of people when I am low too – so you are not alone in this. I would try talking to one of your doctors next time you see them to see if there is support available as well as the treatment/monitoring you are getting at the moment? Maybe you could go to your GP and talk with them to try and get some help? Counselling or perhaps medication may help. Both worked for me…
Anyway, getting it off your chest is a great first step. Keep talking here if it helps.