I can only share what I experienced during my 'torture' of GD... but these are the rules I got the lecture about...
You can have 1/2 a banana, or a couple of biscuits (cookies) as a snack as well (but check the carb content per serving to see how many you can have). Small apples aren't too bad either. Salads (lettuce/tomato) are also 'safe'. Some breads are also ok to have a slice or two... normally soy/linseed type ones. But it is all about reading the labels and working out how many carbs per serving (and what a serving is). Stay away from oranges/orange juice as it will send your readings rocketing.
The trick is to space the snacks out and try not to have more than 15 g carb per 'eating session' (although you probably know this from your nutritionist). You can eat a 'snack' every hour or two. If you're doing blood tests on yourself, you can also watch how different food affect your blood sugars and work out what you can have 'more' of and what the ideal gap between 'carb' snacks is. For example, cereals sent my readings through the roof, even though they were supposed to be 'good'.
In terms of main meals, the trick to remember is the limit on carbs. You shouldn't cut them out completely. So you can have a maximum of a cup of rice with dinner, or a cup and 1/2 of spaghetti, or 1 potato (in any way you like it). However, where you can be hit unexpectedly is with any sauces... so you need to check the carb/serving on sauces as well before using them, and be wary of your white cream sauces which are normally higher in carb content.
The low-fat stuff should be avoided as it tends to have higher carbs than normal stuff.
I can completely relate to your dilemma as I had GD with my second from 20ish weeks and was miserable to the point of developing anti-natal depression.
I was able to manage the GD for about 10 weeks with the low-carb "diet" before my body 'gave up despite sticking to the rules' and had to go on insulin (fun with a needle phobia I tell ya).
Good luck, and fingers crossed you can get through it quickly... although I know from experience 8 weeks seems like forever with the shadow of GD over you.