The person you had a fight with are they a regular vexatious influence on you.I used to feel suicidal depressed after a run in with either one of my narcissist members of my family.

They were the problem and after getting away from them my mental health and physical health is much better.

I haven't been suicidal since I cut my awful narc sister out of my life 1 and1/2 years and I am improving mood wise it has been a month no contact with my narc mother,both of them bullied and abused me so I have had my peace returning.

So just wondering whether it isn't you feeling suicidal or whether it is other people causing friction and arguments driving you to suicidal feelings.

It can be very subtle and you not realize it is the other person's fault you are feeling that way.

If this is so you need to cut them out of your life even if they have made you feel helpless and dependent on them.