For someone to experience gall bladder
problems at this age is quite rare. Gall bladder diseases are more common in the middle age group and more among women than men. In case, you are overweight
or obese for your age, we could still think of gall bladder issues.
Your symptoms mostly suggest indigestion
like picture. You will benefit with TUMS or over the counter antacid medications for a month or so.
Overall, your eating habits look not fine and this may be the reason for you having blood in stools, rumbling sounds, gassy feeling et al.
Please take bland food rich in salads and fruits and consume plenty of water orally. If your symptoms increase, you may have to go in for an upper gastrointestinal endoscopy
I wish you get well soon.