The Bible and Suicide
Suicide is mostly contemplated in distress, hardship, anxiety. But, no doubt, this hardship may also be as 'the trying' of Christ on your person   - if so, you, no doubt, will know it: for he will let you know it. 

MAT  10: 21  And the brother shall deliver up the brother to death, and the father the child: and the children shall rise up against their parents, and cause them to be put to death. 
MAT  10: 22  And ye shall be hated of all men for my name's sake: but he that endureth to the end shall be saved.  Enduring meaning not turning away from Christ, not turning to evil, give-in to Satan, but stay in God's house forever  - with his commandments.

Indeed, the Gospel does not prohibit suicide, it forbids 'Murder'. You can not murder your self, but only 'Kill' your self.  Lukewarm Christian opinion on the matter does not count    - but only Christ's... and he never mentioned it.

We now must:
Define Murder:the unauthorized killing of a creature, men or beast ( a creature with a soul (blood), not plants ).
Define Killing:  the putting to death of a living creature: chickens, beef, pork, men in self-defence without intend to kill, save if we absolutely have no choice, as that would still not be murder.

Define Authorized Killing:  killing authorized by God. We can kill all beast for our need or our protection, but not murder them (kill them for the sake of killing), due to the commandment "Thou shalt do no murder".
Define Unauthorized Killing:  no killing animals for the sake of a shoot and leaving them to rot, but eat them or give to somebody to eat or use their fur for our need for else this would be murder.

Now if we feel life is too heavy on us and we want to end it then, if we kill our selves,  our live belonging to us, we did not commit murder as that is not possible; 'self-killing' is not murder and God, like with masturbation, did not prohibit it.   And did we then ' persevere unto the end '?  We actually did, for we did not turn from God and the truth, but remained in our faith and did not turn to Satan to solve our problems, but we choose death.   So we persevered unto the end, though we called the end.  It would, indeed, be a pity if you are not baptized to the remission of your sins  - and you can then only hope for his mercy on the day of judgement.

Love your neighbour like you love your self.  Would you like to suffer in pain and misery, or would you prefer death? Did Christ prohibit assisted-killing, where the person, capable of making a choice, has chosen for assisted-killing? Surely, where the person cannot make such a choice, due to mental or physical inability, a Christian may make the choice for them, showing mercy on the sufferer    - in the event the sufferer would have Chosen for for this anyway, were he capable.
 

 

 
...And The Gates Of Hell Shall Not Prevail Against It
Through the ages Catholics and other Nicolatians tried to defy the above quotation by Jesus, oppressing and murdering many, deceiving and misleading many more, but they have not and shall not prevail against 'His Church'.