Your extreme tiredness
could be bacuase of various causes like
As far as pregnancy
is concerned,there can always be a possibility of that since you are doing sex almost every other day.
The best way is to get your urine tested for pregnancy and consult a doctor for relevant investigations for the above mentioned causes.
Make sure yo keep your blood sugar levels in normal range and this means proper diet control and regular exercises along with medications.
Bloating could be because of taking metformin