PRET(GHOST) LOK
A passionate man, whose mind is filled with lower appetites and strong sense-cravings, who has spent his life in much sensual indulgence in this earth-plane, enters the Preta Loka (astral world of gross density) after his death. He is unconscious for a short time after death. He is in a sleepy state. He awakens and finds himself in this Loka, or world.
As soon as he wakes up, the sensual cravings, desires and appetites torment him immensely. He wants to eat, drink and enjoy with women. But he cannot gratify his desires now with his present body. He is kept in this world just as a prisoner in the prison. Therefore, he is extremely miserable and unhappy, as he cannot gratify his passion in this plane. The senses are powerful, but he cannot get here the means of gratification. His misery is beyond description as he is not able to satisfy his passions, cravings and appetites. He is just like a starving man.
The passions have their roots and centres on the senses and the mind. They are not in the physical body. This physical body is only the instrument of gratification in the hands of the senses and the mind.
You can help the sufferer in the Preta Loka by performing Sraaddha (religious libations and offerings). Performance of Sraaddha helps to free him and make him pass on to Svarga, or heaven. The Mantras recited set up powerful vibrations. These vibrations come against the body which imprisons the individual soul, and break it for its freedom.
Do you realise now the importance of Sraaddha? Those who have left doing Sraaddha on account of ignorance, perversion of intellect caused by wrong Samskaras and bad association and hearing of wrong teaching should perform Sraaddha from this moment at least. Rishis and Sastras take care of you like kind mothers.
If you do not wish to enter the Preta Loka and undergo the sufferings, learn to be wise. Learn to control the senses. Lead a well-regulated and disciplined life. Do not allow the senses to run riot. Give up gluttony. Do not follow the philosophy of flesh. Passions and appetites will only torment you when you pass through death. If you practise self-restraint, you will enter the regions of bliss.
EXPERIANCE OF PRET
Sage Vasishtha says in the Yoga-Vasishtha:
"The Pretas are of six kinds, namely, the slightly sinful, the ordinarily sinful, the greatly sinful, the slightly virtuous, the ordinarily virtuous, and the greatly virtuous. Some of the most sinful Pretas continue to be experiencing the insensibility of death( being ghost or pret lok) like a stone for a period of a year. Regaining awareness they experience that they are doomed to suffer from the endless torments of hell which their Vasanas have brought them, for a long time. They then undergo the experience of hundreds of incarnations until they finally get rid of the experience of world-illusion, by finding peace within. There are others in this class, who, after their torpor of death is over, begin to experience the unutterable pain of insensibility in the form of immovable trees, etc. Then they undergo the torments of hell, after which they are again born on earth in accordance with their earthly desires. Those of ordinary sin experience the inertness of stone for some time after death. Being awakened to consciousness, they, then or after some time, undergo the experience of the lives of birds, reptiles or beasts, before they turn to their usual lives in the world. The slightly sinful souls, often immediately after the insensibility of death, come to assume some human form to continue their earthly existence in accordance with their previous desires. They come to the worldly consciousness soon after their death and their previous desires and imagination evolve new worlds in their experience in a dream-like manner. The greatly virtuous souls, soon after the insensibility of death is over, get an experience in the worlds of gods. Having enjoyed the fruits of their virtues in godly personality and in heavenly worlds, they are again born in this world in noble and rich families. The souls of ordinary virtuous experience, after the insensibility of death is over, that they are being carried away by winds and later on are turned into the lives of plants and herbs. Having undergone this experience for some time they feel that they are entering human bodies as food, and there they are turned into spermatozoa and thence enter the wombs of (expectant) mothers."
[Taken from book "What happens to saul after death" by swami shivnanda, will post more detail of ghost from garura puran and atma puran latter]