I Have Been Taking Humalog 75/25 25 Units In The

I have been taking Humalog 75/25 25 units in the Am & Pm . My blood sugars continues to be high. Now my doctor wants to add Lantus in the Pm . I was feeling awlful had some vision changes , along with a small area on my stomach that was a carbuncle . How long does it take for me to feel better