Don't try any of this. I worry that what you'll accomplish is making yourself sick, and seriously stressing your kidneys.
You have 0.1 gms amitriptyline; lethal dose is considered at least 6 gm.
https://en.m.wikibooks.org/wiki/Suicide/Amitriptyline_cocktail
I know it's very difficulty to OD on SSRI meds like Fluoxitine; not impossible, but not easy.
I also don't know if 96,000 iu of vitamin D is lethal, but I don't think so. According to this article, not even close:
"While high
Blood Calcium Levels are useful to determine an overdose on vitamin d, it really takes an
AMAZINGLY large amount to cause a Vitamin D Overdose. In fact, in East Germany between the 1940's and 1960's, children would
ROUTINELY get 6 doses of 600,000 IU's of Vitamin D between birth and 18 months old."
https://www.easy-immune-health.com/Overdose-on-Vitamin-D.html