Old diabetes, shivering. To you.

Sir,my father is suffering from diabetes since a very long time,say 15 + years.he is on medication but not on insulin injections.i noticed him shivering many times.symphtoms-shivering,forgetfulness,weakness in body,disbalance while walking and low BP.I also fear any heart problem as well.i would like to visit you in the coming days for his diabetes management and lifestyle correction along with diet management.i believe your immense experience can help my father lead a healthy lifestyle.please tell me if there is an urgent need for tests so that any problem coming could be checked beforehand.without wasting anymore time I just want my father to do only what is right for him.awaiting your kind attention towards this issue.shall be grateful to you.