I take one D3 (5000 IU) daily and have for a number of years. I have had absolutely NO ill effects at all.
On the other hand, I quit watching and listening to Sean Hannity a couple of years ago because I was beginning to suffer a strong desire to smash my television and radio because of his very annoying manner.
That's 1/30 of what this dude was taking ...
I drink about 1 gallon of water every day. I'm quite healthy. That would probably not be true if I drank 30 gallons of water every day ...
4-5000ui is plenty and also safe. 150,000 is a bit much.
and borax powder?
Makes a decent ant killer.