Thanks for asking the query,
Swollen gums and dry mouth can be due to vitamin defieciencies , dehydration
is a eating disorder , i would suggest you to consult a GP and a Dietician , follow a healthy eating habits and proper nutrition .
With proper counselling
one can develop and follow meal plans to manage healthy weights .
Diet also plays a vital role in preventing gum diseases ensure you drink plenty of raw vegetables , fruits like oranges citrus juicy fruits , salads . Avoid eating aeroted and carbonated drinks .
Drink plenty of water and keep yourself hydrated.
Get complete mouth scaling and polishing done .
Maintain a good oral hygiene .
Take vitamin suplements.
Hope this helps out.