If you commit suicide, it is absolute that you go to hell? Is it absolute?
Good question. I'm afraid the only proper answer is through doctrinal study in His Word to understand His Plan for every believer.
There definitely are strong theological positions which assert condemnation for those who commit suicide. There also are other theological arguments asserting once saved, always saved, and the believer who commits suicide will still have eternal life, but not all the crowns which had been predestined for him/her.
I've found that by placing faith on Christ, being occupied with what He did on the Cross, manifests a true love for all mankind and obedience to the Sovereignty and Will of God the Father.
Rather than pity, compassion, or sharing the thinking processes of the person with suicidal tendencies, a far more loving and truthful approach is to focus on what God Provides and what the Cross is all about.
Those who focus upon themselves, will also be tempted to identify others who don't share their thinking, as being equally arrogant as themselves, but until one places God as the object of their thinking, they never will escape their attempts to counterfeit anything other than God as the object of their thinking.
Fear of death will not prevent dying, but it may prevent living.
Only God can determine that. None of us knows, for certain, because we have no idea what was going through the mind of that person, at the instant of his or her death.