So lately (a couple weeks) I haven't been able to eat... I eat around 600-800 calories a day, and I don't know why. I have a couple bites of food and my stomach feels full and sometimes I get stomach pains. I'm in overall good health, except for cancerous cells found on my cervix due to HPV. Could that be causing my no eating problem? I don't really have an appetite anymore, and I usually only get hungry here and there. I tend to eat pretty healthy except for the occasional chinese or pizza. I haven't changed my diet or anything, so I doubt it could be the food or anything else I'm doing, since this just started around 3 weeks ago...

Also, how can I raise my calories with healthy snacks? I can't eat meals because they will hurt my stomach, but I'm trying to lose 14 pounds and I've been told if I don't eat much, my metabolism will be slow and I won't be able to lose weight.

Metabolism slows if you do not eat at all. That's why it's important to have something for breakfast. Eating less than you are hungry for several times a day while increasing activity is a good way to lose weight.

Feeling full after only a few bites is called early satiety. Nuts and seeds are good calorie sources, although many of the calories come from fat. They provide roughage too.