im not sure..
for me sometimes i dont want to be alive anymore, simply because i dont want to live like this anymore... i dont want to die, i just want to be happy, i want a different life without the pain and suffering... i am not suicidal and never thought about creating any type of plan... i however often think that things would be better off for everyone if i was not here anymore... including my own pain and suffering ending...
but my memory is so horrible that i dont know what is going on from a minute to minute basis atm, i end up even forgetting that i have any problems, but reminders are everywhere so im constantly reminded that im just in a dream world that is outside of reality... after some time experiencing this the distress increases... one would think its nice to forget you have problems, but when your problems are not forgotten, they are simply put in the dark and still very active... it is hell to go through continuous cycle... disconect... reconnect... where am i? jesus!! lalalala, whats going on..? omg i cant believe im still here! lalalala... omg its time to go to sleep..? i dont know whats going on

in the midst of addiction, depression will grab ahold and try to strangle the life out of you... to keep you in the chains bound to that you want to get away from desperately... that can cause these feelings...

withdrawal from substances has high chance of causing depression and anxiety...

you may have already read about it, but looking into addiction may be beneficial...
its very difficult to convince someone with addiction that they need help... and you have to do it delicately... you dont want to come off as saying "you have a problem, you need help!" in my experience this causes to just get angry and ignore and avoid and to use even more out of spite because i DONT need help and dont need anyone telling me i have a problem, kind of thing...
end up thinking that the substance is helping the bad feelings go away, when its just keeping the bad feelings around because we cant face them...
covering stuff up with falsehoods...

i cant speak for anyone else, i am not a doctor and for sure dont know what is going on inside my own mind.. but this is just my take...

i would try to articulate my words more but i really cant right now...

here just a couple articles
https://en.wikipedia.org/wiki/Alcoho...rawal_syndrome
Depression and Addiction | Dual Diagnosis

i hope the both of you can work through this together... try to be there for each other...
many hugs