What do I do??

[naesco]

I take it you have someone who is looking after your tank while you are gone.

Anyway, go to lfs and buy some garlic extreme. Phone first to see if they carry it.
If not you can buy garlic extract from a health food store.
Soak dry food in the garlic extreme for ten minutes a feed the fish.
Use only dry food as you want the garlic to soak into the dry food as the whole idea is to get as much in the fish as possible.
You also need to feed the food 2-3 times a day and only garlic soaked food.
Good luck