How high are my chances of getting a Stomach Cancer? How and Where can I go for an early diagnosis/prognosis?

[full Metal Man]

DETAILED DESCRIPTION : -

I am 21 - Male. Indian, lives in India. Vegetarian (but eat egg dishes for few months).

I've been a heavy eater since my childhood, mostly the market available junk foods, and street foods available in India.

And since past few years, since when I was 15 OR 16, my entire 'routine-cycle' became haphazard, because I was also under depression because of being bullied in my schools.

And I was also porn and masturbation addicted for almost 3 to 4 years, which added to my depression, and social-shyness.

Since then I didn't care about eating. I cannot control myself, when I see delicious Indian dishes available on streets in India. Even at home I eat whenever I like , and many times, even during late-nights.

And from last 2-3 years, my sleeping habits also are not regular.

I also have anxieties related to my body, because I believe my masturbation addiction of past, has made my body very thin.

So fearing I would loss my muscles and strength, I started eating excessively, and mindlessly. This is how I started eating egg-dishes (but has now stopped eating it).

Sometimes when I eat heavily, I got stomach aches few times, but then it went away, and I neglected.

But talking about this week, I eat very heavily, more than I can consume. I didn't vomited, but I had to go to empty myself, almost 4 to 5 times, of which 2 times also in a diarrhea like condition.

So a day ago, my I felt a pain in my stomach, like someone was pulling my stomach from inside. Before that I also felt 'Gas...' situation in my stomach, and during that time, I felt I like eating nothing (but it went away latter)

And yesterday, I slept for more than 12 hours, from late night @ 2:30 AM (nowadays I sleep mostly very late at night) till 3:15 PM , next Afternoon. And still on evening, I was feeling very drowsy and I had to take a 'Nap' for 1 and 1/2 hours.

So noticing these strange changes in my body, I fear about Stomach Cancer. Can I have it? And to check it early whom should I consult? And which medical tests should I go through?

I am not Obese, but then also eating has become like Alcohol for me. But I think I'm still in depression, because of still being bullied at my college.

And I've also grown up in a financially-poor family. My family also had a case of long running feuds with one of my close relatives (which happens mostly with every Poor Indian Families)

Which is why, still in my depression, I feel very anxieted about my parents. And constantly keep thinking about them? As to what will happen to them if I die? They're in their 50s.