Death is of Three Types

Imam Muhammad Taqi (a.s.) has related from his forefathers that Amirul Momineen Ali (a.s.) was queried by someone about death. He replied,
"You have come to the knowledgeable (personality)." "Death occurs to a person in one of the three ways:
He is given the good news of everlasting bounties, or informed of the never-ending retribution or he remains in a perpetual state of terror and fear. His affair remains undecided and unpredictable, and it is not known about the kind of future that awaits him. Then (you must know) that our devotee who is obedient of our command and does not sin, is given the good news of everlasting bounties. But our opponent shall forever be involved in Divine punishment. And the person who has been unjust to his soul and who has abused it will be found in an unsure condition. Unaware of what the future will hold. Such a person is a sinner whose death will be accompanied with terror and fear. But Allah will not consider him on the same level as our enemy. Rather he would be removed from Hell because of our intercession.

Then, act (rightly) and obey the commandments of Allah. Do not consider the Divine punishment to be trifle, and certainly there are such people who would not be able to receive our intercession till after 3,00,000 years."(Behaarul Anwaar vol.3 quoted from Ma'aniul Akhbaar) 

I am Concerned About You Regarding Barzakh

Umar ibne Yazid says that, "I asked Imam Ja'far as-Sadiq (a.s.), "I have heard you saying that all our Shia's will enter Heaven however sinful they may be?" Imam replied,
"By Allah I had truly said, they shall all belong to Heaven."

Then I asked, "May my life be sacrificed upon you, even if their sins are great and in large number?" Imam said,
"All of you (Shias) shall enter Paradise by the intercession of the Holy Prophet (s.a.w.s.) or his successors on the Day of Judgement. But, by Allah I fear for you the Barzakh."

I asked,"What is Barzakh?"

He replied,
"Barzakh is the grave. Its duration commences from the time of death until the Day of Judgement."
(Al Kafi) 

Tears of Blood

The Holy Prophet (s.a.w.s.) called the attention of Ibne Masud and imparted some advice to him. He said in this regard.

"Never imagine a sin to be trifle and small and abstain from the Greater Sins, because, on the Day of Judgement, when the slave beholds his sins, tears of blood and puss shall flow from his eyes. At that moment Allah shall say, "This is the day when everyone shall see his good or bad deeds, and wish there be a great distance between them and their sins."
(Behaarul Anwaar vol.17) 

It is also related from the Holy Prophet (s.a.w.s.) that he said,
"Verily, a person shall be kept imprisoned in Hell for a hundred years for each of the sins (that he commits)."
(Al-Kafi)