off/on bad abdominal pain after eating

iam a 20 yr old obese female. for the past 3 months or so i have had really annoying pains in my abdominal. these sharp stab-like pains always occur after eating any kind of meal. they last for about half an hour then go away. sometimes they come on thier own but usually after i eat. i feel weak a lot, have a loss of appatite, feel nausea, feel like vomiting (although i never do) and sometimes they start before i even finish eating my food. the funny thing is that the pain shows up for like a week or two, then the next week i wont have any stomach pains at all. havent gone to the doctor because i have to pay out of my pocket. can anyone help me?

[mammo]

It sounds like it could be your gall bladder,  But regardless, you need to see a doctor, pain is the body's way of telling you something isn't right. See if there is a clinic that will see you.

[BeastLoadER]

could be an ulcer(s) is your stool black?

[ikabuslw20]

my stool has been black before but not everyday....im going to see if i can get healthcare this week