Hello, sorry to hear this, my husband is a cocaine addict, in and out of recovery. I knew nothing of cocaine and was similar to you I had no idea he was using, but now know he has been on and off for many years. Four years ago, he was in the hallucinations stage and it got really bad, that was when he was using everyday many times and it obvs got too much for his brain. Its great that your son hasn’t used for six week, hopefully it stays this way, he will need a lot of support, but its down to him to gain that support, you cannot control, change anything. If this is new to you, then let me give you some advice that I wish I had listened to many years ago, dont bother doing anything to control this, you cant its too big for you. Get yourself to an Al Anon meeting if you can and try to surround yourself with others who understand, I’ve been going for five months and although at first I was thinking what the heck is all this about, it has massively helped me.
In answer to your questions, yes the paranoia and delusions do subside, but only if they stay off the cocaine, they will always be there lurking in the background ready to pounce again, but with him working at it then there is a lot of hope.
My husband still has relapses, but these side affects are no longer present, but he also knows that they will come back if he doesn’t quickly get back to CA/AA and work the programme.