are emulsifiers, stabilizers an food additives bad for you?!

Egg yolk isn't necessarily good for you. Mustard makes a good emulsifier between oil and vinegar (salad dressing - homemade).

But yes, most food additives are not good for you. Best advice I can give - cook from scratch. That way you have complete control of what goes into your food.

Oh, and you're probably looking into sugar alternatives. Truvia seems really good, as it's minimally processed, unlike Equal, Splenda, and aspartame (which turns into formaldehyde in your body). Agave nectar is also a really nice sweetener, and it tastes a bit like maple syrup (the real kind), although I'm not certain it's okay for diabetics.
Brown rice syrup (can be found at health food stores) is also a really nice, mild sweetener. It's made from brown rice and is also minimally processed.

Also, something that I feel that I should point out - weight does play a role in Type 2 diabetes. I'm sure you know this already though. It's best to aim for a BMI of 22, if you're not there already.

Also, something that may help you as well is a macrobiotic diet (not a short-term "die-t"). I'll list a few pages about that below.

Hope your mom is doing all right.
My family health history consists of diabetes too.

http://en.wikipedia.org/wiki/Macrobiotic…
http://www.webmd.com/diet/features/macro…
http://www.livestrong.com/article/325920… (I like this one best)
http://www.holisticonline.com/remedies/d…

Look at it this way :: they don't put additives in there because they're good for you but because it's good for THEM, allowing your foods to perhaps be more presentable, but giving them much longer shelf life, to extend flavours and many other things, like making them more money!
Some may be OK for you by accident, but no, they're mostly bad!
A good example is substituting HFCS (high fructose corn syrup) that's really really bad for sugar that's 'only' bad!
Hope your mom gets well!
.

no..an example of an emulsifier is egg yolk.

depends.
If the additive is chocolate to powdered milk, then no.
Stabilisers are to make sure the food stays as fresh or liquid as it should be fresh.
Mostly stabilisers and additives are for processed foods with no shelf life and a bland flavour or colour.

They are not what you nana would use.

Emulsifiers are to change the texture- oil , egg, banana, apple sauce can be emulsifiers. When it's liseted on a food label, usually it will be synthetic. In that case, I don;t eat them,

I just don't. I don't spend money on food that I would avoid if I was making it myself.

I would take this opportunity to stop buying crappy processed foods. They are total junk usually. And they are why people are getting ddiabetes and cancer.
Make your own food, it doesn't have to ve hard work, and it WILL be cheaper and healthier.