can be due to Metformin
which you take 1000 mg twice a day. Januvia
are less likely to cause these symptoms. Did your doctor start the tab Metformin at this dose all of a sudden? If yes, then you can cut it down to 250 mg twice a day for three days, then increase it to 500 mg twice a day for next two days, then 500 mg THRICE a day for next 1 week and then come to the current dose of 1000mg twice a day. Also you should use a 'sustained release' form of Metformin. Request for its prescription with your doctor.
This should take care of your all symptoms. If you keep feeling the same in-spite of this regime, then make sure you are not running with low sugars for the rest of the day and also get your liver function tests done.
I hope you got your answer. Please get back for any further query. Take care.