Gastric Formation. Daily routine badly.

Hello, I am 29 year old. I am suffering from gastric problem from a long time. Main reason is due to improper diet throughout the day, I was a bachelor 1 year ago and from around 3 years I use to skip lunch and breakfast some or the other day due to being too busy at work. Now from last 1 year I have started having lunch everyday on time. But I am facing trouble with digestion, my cholesterol is high, my weight has increased, gastric formation has increased even I don't eat spicy food and outdoor food. I walk near about 10 kms a day. From past 3 days I am having loose motions stomach is aching, stomach is getting heated from inside and gastric formation is there. Please suggest something for recovery from this thing it is hampering my daily routine badly.