Diabetes consultation. And sleeples!

Hi doctor, My mom has diabetes since 3 years . She got to know about it when she went to get dental treatment. And she found out the sugar levels were above 300. The doctors prescribed metformin 2500 mg initially along with gilmepride 1mg . And later it was reduced to metformin 2000mg and gilmepride 2 mg . Since few months my mother is facing leg pains at night . And the doctors suggested pregabalin and mecobalamine tablets . Now since a week she is not getting proper sleep . Few days she is not sleeping at all . Upon consultation doctors changed the dose to metformin 2000mg (1000mg morning and 1000mg at  a night ) andlmepride 3mg and continuing pregabalin and mecobalmine tabs . Apart from these she is taking bp tablet envas and also calcium tabs daily . She is worried about these health changes now and then .Inspite of taking so many medicines regularly and maintaining proper diet she is experiencing these issues . Doctor please help how can she get rid of these pains and sleeples