Your diet would then consist of vegetables (leafy greens, salad veges, avocado), some nuts, and proteins with fats. People following low
carb diet typically need to increase salt and electrolytes
intake, and drink plenty of water (unsweetened tea, coffee, etc also ok).
It can be hard to follow a low carb diet if you are eating vegan, so you may wish to research.
Again, hope you can find medical help as well. Please let us know how you go.