How can you sense a spirit is there

Be aware of your own mind and body.If you are receptive,the answers you seek will come to you in your "mind's eye".Information can come as emotions,audible or inaudible words,images, or physical changes in the way your feeling.I get sickly and weak when interacting with strong bad energies.

it could be him, ive seen many cases like this. if he wants that u should feel him then only you would be able to feel that he is there.there r some pple who cn feel spirits.............do u have a smartphone cos that can help u as it can detect elctro magnetic feild which spirits have. i have it n i wish i could help u out.

By feeling it's presences, and or their personal vibrational signature.

And yes it possible that it was him, spirits we know do things like that.

No. It's your imagination.

Doubt it. Theres no such thing as ghosts :D

If you base your interpretation on your feelings you will probably have the wrong result.
Fear or hope can produce shivers or tears without any real trigger outside of your own imagination.
Lots of people trade on your hopes and fears.
They are not usually bad people and probably sincerely believe.
They are sincerely wrong.
Science would have noticed spirits if they were real.
Spiritualists claim it is scientific but scientists think it is imagination.

Many individuals report having a sense of presence in their surroundings from time to time. Though having this sense or feeling of something around you can surely get your attention, it does not always mean that there is someone or something around you but could.We are sensitive beings by nature. Our instincts and senses are quite keen and just like our friends in the animal kingdom we can pick up on all sorts of extraordinary things. From psychic abilities to precognition many individuals report having experiences with these phenomenon all the time.

The spirit world is a quite strange and mysterious realm and one that we do not completely understand. Many individuals report encounters with the spirits of past loved ones as well as encounters with just random ghosts and spirits as well. These beings could show up for certain reasons such as to warn us of some type of danger. They could act as a guardian to us and appear in a time of need. It is not out of the realm of possibilities that you have encountered the spirit of your brother. I would keep an open mind, which you very much seem to have. This world is full of mysteries and we will most likely come in contact with a few of them throughout our lives. Take care.