MODY is a genetic form of diabetes ie it runs in families so there would be a parent or grandparent with diabetes .
If you have it then it will depend upon the type of MODY as to the treatment.
Some people with MODY take sulphonylureas,(you are already using gliclazide) others insulin. People with MODY are sensitive to insulin and take comparatively small doses.
This link is to the Exeter university research centre. They are world authorities on MODY so any info is very accurate;
http://projects.exeter.ac.uk/diabetesgenes/mody/info.htm
The best general article I know about MODY is by Jenny Ruhl who herself has MODY
MODY - It's Not Type 1 and Not Type 2, but Something Else (put that in google and you will find it)
Just to confuse you, there is another condition called LADA . People with LADA may respond to oral drugs for a while but they either don't work well or stop working. LADA is a slower developing form of type 1 and occurs in adults of all ages.
This site is written from a UK perspective.
http://www.locallada.swan.ac.uk/faq.html
Well done to your doc for refering you to a specialist, it doesn't always seem to happen.