I have one major suggestion about poor absorption:

The scoping is to see if you have frank damage to the lining of the stomach and intestines. But it will NOT show gluten intolerance per se. The blood tests for this would be better and more revealing. There is also a stool test by Enterolab that can reveal intolerance.

http://neurotalk.psychcentral.com/thread115630.html
and
http://neurotalk.psychcentral.com/thread115919.html

jccgf has a website called The Gluten File:
http://sites.google.com/site/jccglutenfree/

This can be helpful too.

Don't hesitate to post on that forum here and ask further questions.

I would also recommend the activated forms of B6, B12 and folate if you can get them where you are.
Methylcobalamin
Methylfolate
P5P (for B6)

iherb.com does ship to some European countries.

Some people have genetic failures in converting the vitamins in pills to the active forms in the body. The RX vitamin Metanx has all 3 active forms, but I don't know if you have it where you are.
Some doctors don't know about "activated" vitamins, and assume all pills are used equally by everyone, and that is not true.

Your calcium may be high due to the low magnesium and low D possibility. You need a test for D.
The calcium may become normal after you get things balanced.
Magnesium is needed to get calcium into the bones. If you are low the bones are giving up calcium to the blood to help run the heart and nervous system. Vit D enables absorption from supplements and food. Low D means poor absorption, so the bones get robbed.

That homocysteine is dangerous... it can lead to stroke or heart attack. So your focus should be on that first, and Vit D levels.