Trying to get to the root of my late onset early stammering

Trying to get to the root of my late onset early stammering The first time I stammered was when I was 22, I wrote it off but noticed that it would come back at time over the years. Now, I used to use a lot of drugs, I don't anymore except for Klonopin and Suboxone, I think these are contributing to the problem. The Klonopin is prescribed for myoclonic epilepsy. I haven't had a seizure in a long time but I've had some pretty nasty ones where I've come to in an ambulance, on the floor with my tongue and lip all bit up. Klonopin is the only thing I feel safe taking as I have never had a seizure with a benzo on board, and likely need one. Another thing is I have a LOT of myoclonic jerks when I'm trying to go to sleep (you know the feeling how you are falling right before you go to sleep?) They're not too bad, just light twitches. The drugs I used to be addicted to were opioids, whichever it didn't matter, heroin, oxycodone, morphine, whatever. I have been on Suboxone before and I remember I tried to get high off of it and it giving me a seizure, no doubt in my mind that is what did it. Kratom has also given me a seizure before. But full agonist opioids don't do this. I think it's because Buprenorphine and Mitragynine (active chemical in Kratom) act at the Kappa and Delta opioid receptors as well as the Mu receptors (the one's that cause pleasure), full agonists, at least non atypical opioids only work at the Mu receptor. The thing is is when I was 22 and stammered I was on none of these drugs and wasn't using at that time either so I'm not sure. The one thing I HAVE noticed is that when I do stammer a lot of the time it happens when I'm talking to someone about things like maths or physics, shit that I have to access executive memory in my brain and explain it. It also happens when I get nervous meeting new people unless I've had a drink or two as well. ​ Anybody have tips on how to stop stammering? I think I just may be talking too fast as well, like my memory and central processing are going too fast for my speech center's processing. ​ Edit: Wanted to add I am 29 now