Digestion problems occurs due to your food habits like over eating ,without hunger pank you eat something ,constipation, no fix time for food,late night sleep,junk food frequently.
According to you,you r over weight so you should be careful for all those things because of indigestion you are suffering from fatigue and weakness and also it's due to Obesity.
Next Steps
you should consult an Ayurvedic doctor
and change your food habits.
Health Tips
Take lite diet like Moong dal soup , khichdi,
dry ginger powder with warm water .
exercise,regular diet ,regular sleep .
stop junk food, Bakery items .
Ayurvedic medicines and food suggestion have very good results.