280 + pound newbie with short terms goal of 50 pounds by Christmas-

Hi, I used mfp in the past and with locarb diet lost down to 250. Had medical issues and family problems..blah blah. anyhow I am back up to almost 300 pounds and I feel miserable. I am hypothyroid. I am always tired, sleepy, no energy, leg and knee pain. I just want to feel better. I want to get down to at least 150 pounds but I would like to start with my first goal. Anybody want to friend me and lets do this together.