doberman leaving him with mom for 3 weeks

I cant stop thinking of my doby. Ive now been gone for a full 48hrs and i have 2 weeks and 5 days left till i can go back to him. He's been on my mind all day, i call my mom to ask her about him and she says he's fine. He's been with me everyday since he was 8 weeks and i just worry so much...