I never had a problem with constipation probably ate too much anyway because I would be a little overweight. Recently had a flu and got very bad diarrohea lasting up to 12 days. When it eventually stopped i took some iron tablets for a few days but got very constipated so stopped. Since then I have been constipated only going every two to three days. I dont have any pain.  I am now eating a lot healthier drinking loads of water and eating loads of fruit and cutting out junk food. But my system feels all wrong. At night when I sit down I have fierce pressure it reminds me of when i was pregnant an uncomfortable feeling  which I had in my last month or two of pregnancy, I feel my stomach is pressing up on my rib cage. I am sleeping fine on my side its just when I lie on my back I get a real uncomfortable feeling. I also feel I am gaining weight as my stomach looks bloated. Too scared to go to doctor. It all seems to be since that bug. I am also passing more urine but don't have any pain but that's maybe because I am drinking a lot more water. I am 52 years old.