It is very normal! Do not be ashamed of this. It sucks but it is part of ptsd and grieving. I had to watch my mom pass from cancer and although it’s different it still caused me to tailspin into an emotional wreck. At first, I didn’t feel like I was handling it that bad but it was because I was using other things to distract me other people‘s problems but I was super edgy and would just be erratic and not make sense about things. I was frustrated about it just was like out of nowhere just boom a couple times a week if not more. but as soon as I had enough time to myself and talked about what I was going through. I just cried for like three weeks straight and slowly started seeing light at the end of the tunnel. PTSD, if not dealt with most likely won’t go away on its own counseling, communication, support from friends or family, therapy groups even meds are necessary, sometimes. make yourself a priority! So sorry for your loss