I want to share my experience and how my anxiety levels have improved. I am not a doctor and I am only posting here to share my experience. I am 31 years old decently healthy male, Army veteran. Vegetarian with no major health condition except mild POTS syndrome. Sorry about my poor writing skills!

1 April 2020: I tool 30mg extended-release Adderall. ( I am ADHD) and also decided to smoke some pot. I had a severe panic attack where I thought I was going to die. I went to the emergency room and everything was alright. After that, I started having severe health anxiety every day and a few more panic attacks in the next couple of months. Things got better after a few months but I had developed OCD and anxiety related to my heart (I get heart palpitations) and I would check my pulse like 30 times a day.   life got better October/November 2020. Still get anxious and live under fear of having a panic attack but pretty manageable. During this time I get diagnosed with Anxiety disorders/panic disorder/health anxiety/GAD..... My biggest problem is palpitations which are worse at night.  

January 2021, I am doing pretty good. I am going for 5-10 mile runs about twice a week. Going hiking and spending time outdoors. One night while I am watching TV and eating food, my palpitations are a bit bad. I finish my food and try to find my glucose monitor (which I bought to monitor my glucose levels in 2020) and I get dizzy, my heart jumps to 180bpm, and I call an ambulance. ER told me I had a panic attack but I am convinced it was POTS attacks. The next day I talked with a psychiatrist and he put me on Zoloft. My anxiety got really bad after that one incident. When I went to the VA hospital, I realize someone had committed suicide and it was a crime scene. That really triggered bad anxiety in me. I went on Zoloft and I felt like I was going insane. Severe paranoia, insomnia, headaches, body tremors..... and I quit medication after a week. Body tremors are still here after like 2 months but they are getting better every day. Every day I would get horrible physical sensations and feel twitching. I became a mess and ended up moving in with my brother. About 3 weeks ago, I had some bloodwork done for B-vitamins, Thyroid, etc. Everything was within normal range but B3 and B12 were on the lower side. B12 was like 200pg/ml. I started taking B vitamins along with D3. Things have gotten significantly better within 2 weeks of supplementing. My tremors and twitching are also getting better every day. Somedays, I have 0 anxiety! I hope this will continue and I wanted to share my story will you all! &lt;3 sending love and care 

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TLDR;  I started B-complex D3 supplement and my anxiety levels are significantly better.  NIacin and B12 are very important supplements for anxiety and depression.