Stutter due to the loss of someone important?

Stutter due to the loss of someone important? Hello everyone, I have a weird case of the stutter and I wanted to hear your thoughts of it. I was just an average boy, never had a problem with stuttering, that until when I was 21 years old (25 today), my dad figure started showing weird symptoms, he was getting lost often, didn't know where he is, fainting, etc. (can't believe at this stage of writing the post I'm already in tears) We took him to the ER, after a few scans it showed he had a brain tumor, that caused secondary growths in the lungs, liver, and many more places, we started chemo, and the symptoms were so horrific, I had no idea the human body is capable of suffering that much, we lost him 3 months afterward, I gave him a last hug, knowing it is the last one. ​ Ever since that day I was experiencing symptoms that started coming gradually over the years, I started stuttering here and there, a while after, random panic attacks started occurring, more and more often to the point I actually threw up everything I ate nor drank, excessive sweating, tinnitus, visual snow, and many digestive issues. ​ After countless doctors, age 23, I decided its time to visit a psychiatrist, and his diagnosis was Panic Disorder, gave me Clonex and Cipralex, which made my symptoms significantly so I stopped. ​ Fast forward to today, I managed to get the panic attacks and anxiety under control, still having some of the problems above, and I still stutter, I realized that when I start talking, I have no problems, but around a minute into the conversation I start having these annoying blocks, like I know the word I wanna say, I open my mouth, but, its like the vocal chord doesn't wanna work with me, just, stuck, and it gets me so frustrated, the more I am into the conversation, the more sweaty and stuttery and blocked I get, palms are extremely sweaty, and tons of saliva is being produced. ​ My best explanation is that even though I am relaxed, my body is getting nervous, consciously calm, but the sympathetic nervous system is acting up, and all of my attempts of calming it down fails, this is mentally draining.