How can you sense a spirit is there

My brother died when he was 6 of meningitis and he will now be 20! I have always had a sense that something is here like things moving and noises etc but just put it down to my imagination... i have also seen like shadows n things but that was a while ago. Anyway i have had nothing for months now n then my mum asked me on the phone last night what iv been doing lol.. i asked what she meant n she said her friend (she is a spiritualist) told her not to do whatever i have been doing because something isnt right to do with some man that wants to come round my house! I dont tell my mum much so she wouldnt know but anyway she said dont do it, stay clear n my mums friend said my brother was stood next to her on her right side saying all this stuff and that i shouldnt feel lonely because he is around me all the time checking that i am ok.... i split up with my partner 3 months ago and it is just me and my 2 children now so yes i do get lonely and i met this what i thought was a really nice genuine man off a dating site and he seemed so nice but i found out he was doing drugs so i stopped talking to him so obviously when my mum told me that i was shocked n now when i think of by brother been here i get the shivers lol, do you think it could be him??

First of i think it's him
Also my friend killed himself when we where 12 it was sad and hard to get by im 20 now and only just starting to deal with it. After that happened aloud of stuff seems to follow me around, first of i felt cold spots, hair on my neck would stand up, i seen shadows pass me all the time, hear a voice calling my name. When your confused as it is and feel spaced out you start to think it yourself well i did for a long time. Till i started to see stuff and this guy John trained in all that stuff, he put me on some tests and it turned out coz im an easy going, open mind, helpful person or something like that turns out im stronger with that kind of thing than he was, he trained all his life and they seem to gather around me all the time. I thought it was a con to begin with but yeah i believe now. I found the more relax you are and feel loney they seem to come to you easier.