I've seen many post on this site talking about ghost the often reaction. (What do I do?) in a very panic mode, while its normal to sometimes be freaked out when having these experiences there's no need to act so fearful of it because to me that sounds ridiculous. As a psychic medium i will give you five reasons not to fear the unseen and how to confirm that yes, you have seen a ghost and no your not going insane.
1: spirit doesn't want to hurt you, unless your dealing with a negative spirit which is a whole other topic most of the time that ghost you saw in the hallway is trying to mind its own business. Don't be freak out that you have seen the unseen.
2: Grandma? It really could have been your grandmother this normally happens after a passing of a loved one. I have recently had an experience where I saw my aunt on the day she had past away. I was never very close with her so I was indifference to the matter, but while my mother was very upset about her passing I got a glance of her ghost. I asked my mother questions about what she had looked like only to later be correct that it was my aunt.
The reason I was never close to her is because she was in another country speaking a language that I didn't know and only ever met her once in my life when I was eight. If you have seen a ghost, it's probably a loved one just popping in and seeing how you are doing. Send some love light and healing towards the person, just by speaking it this is just a nice gesture.
3: you used to live here? This is again the same reason as above only that the spirit may have lived in the house before you. This can cause some trouble if it's negative. So, set up some protection and cleanse the place you can also set boundaries. "You can stay and go whenever you please, but don't bug me in my sleep or scared my animals thank you." If this is a good spirit than it will listen to your boundaries and respect it.
4: Kitty! You just saw an animal spirit. Much like humans animals like to visit earth to and what you just saw was an animal spirit. No need to be so afraid.
5: Gods and Angels and other nice beings. If you follow any religion you may have a visit from the God head him or herself. I'm often told that they tend to visit their followers this can be either through advise, protection or support. Angels are very much the same especially if you are thinking of working with these beings you may see them through passing this is them giving you their blessing.
When we see it we either freak out of question if we're losing our mind. If your living with someone who is opened the idea and you know they are experiencing the same. Ask them, if they saw something similar. If they have seen it and experience it then you are not losing your mind, what helped me was also knowing crazy people don't know their crazy. Much like toxic people don't know their being toxic.
In conclusion don't freak out about the ghost. Spirit is not like Hollywood movies and often times are lost and confused that their dead to begin with. You are very much protected spiritual and your spirit guides, Angels and even Gods you may follow will not set you up with something if knowing you can't handle it.
If your freaked out about every ghost encounter then you need to stop watching those revenge movies and jump scares because their either lost, or just want to help.