My doctor told me to take calcium supplements to increase my bone density.
However I noticed that my hemorrhoids get swollen within 48 ours if I take 500mg or more in a 24 our period (I need 1000mg/day).

Many folks in the medical field told me that they never herd about this before
Who is the right professional to go for guidance in order to get down to the
Bottom of this problem? (hemorrhoid Dr. Bone Dr. vitamin/dietitian etc.)

I think your regular family doctor can help you get to the bottom of the matter, or know the right person who can.