With the exception of the sugar I've been all the others for 20 years! Health reasons. I have started having a small amount of Greek yoghurt lately.
You might get a withdrawal headache from the caffeine but push through it. I like camomile tea- buy the Teapigs bags, not the dust in tea bags! Or any other fruit teas. Or hot water with lemon and a slice of fresh ginger.
You can eat oats- so porridge is ok made with almond milk. Add blueberries or other fruit.
Are you allowed soya products? ie yoghurts?
Eggs for breakfast with gluten free toast.
Homemade soups- I use homemade chicken stock from a roast chicken - and make soups with carrots & sweet potatoes, or mushroom, (add almond milk), or loads of root veggies.
For snack you could try nut butters- almond is delicious. But check they are no sugar sort. Merdian are best.
Nut butters on oat cakes- yummy!
Sometimes I have apple slices spread with nut butter. Or celery sticks.
I'm not sure if your diet allows dried fruit? Very high in sugar. If it does you can snack on fruit.
If you are having loads of veg and protein with your main meals you shouldn't need to snack much anyway. if you do, those veggie crisp things are nice- the ones made from parsnips, beetroot etc.
Good luck!