Constipation and indigestion. Bangalore.

I have been having constipation issues since last few years. Often indigestion and heart burning sensation in between. Especially after lunch. I have seen different doctors who found different reasons including vitamin D, and then B12 deficiency which were treated and gradually problem receded. Another doctor recommend probiotics. Now i don't take medicines since the course is over.. I eat more fruits and drink warm water regularly. I also do some minimum exercise or walking daily. Though the problem is much lesser now I have recurrence, especially with constipation. I feel very thirsty and dry in the morning and after breakfast even if I drink lot of water. Sometimes i feel tired after breakfast (after 2h). Earlier it was after lunch. I am unable to find the reason what triggers this.