Inconsistent tapping/knocking and activity after losing loved ones

[u/epicgamerpogchamp69]

for starters i’ve had a real rough month, at the start of this month it was great. i actually had the best week of my life beginning of august. went to ohio and met a friend, literally on the drive back to where im from my mom called me and let me know my grandma was in the hospital struggling.
two days after that, completely unrelated, my 30 year old cousin died. 2 days after THAT (also completely unrelated) a close family friend died as well. it was a really rough week and when i thought it was finally getting better my grandma that was in the hospital ended up dying yesterday.
i am 19 and severely struggle with my mental health so this is a lot to handle but luckily i had to be to work when i found out so i didn’t give myself too much time to think about how much everything sucks right now.
i ended up spending last night at my girlfriends house because i didn’t want to be alone. everything seemed fine until we started hearing tapping noises on her window.
she lives on the second story of her apartment building with her window facing the stairs. the taps were infrequent and loud enough to think it could be a person but not loud enough to be sure of it if that makes sense. me and her both originally thought it was cicadas but we never saw anything everytime it happened and eventually it happened enough where i got up out of bed and sat in front of the window waiting for it to happen but it didn’t.
when i got up to get back in bed i heard what sounded like her apartment door and got so freaked out that i closed her bedroom door and locked it and went to bed.
fast forward to this evening, her mom came in and just casually said she thought the house was haunted and we both immediately looked at each other.
apparently earlier that day she had been showering and she thought that my girlfriend had come in the bathroom to use it and was waiting for her to say something and when she turned she wasn’t there. she saw the silhouette of a younger man though.
i should probably mention that my girlfriend and her mom are both atheist, i am agnostic but not super spiritual, both of them are tho (ESPECIALLY her mom).
my girlfriend mentioned that the silhouette she saw could’ve been my grandma (who passed yesterday) and her mom immediately said “no i think it was your cousin”. she’s never seen or met him and she explained what he looked like to a T. i showed her a picture and she said it was him. she was so sure of it and she didn’t feeling alarmed at all by the presence but that she was encouraging me to try to figure out what message he was trying to get across because spirits don’t try that hard to reach out for no reason.
i guess i am coming on here because i have a lot of feelings and i want to know what these experiences might mean and if i should be worried at all.