Hello. Welcome to the board!
Hungry/headaches/tiredness seem to be at their worst days 2-4. By day 5 most people feel much better.
Well done on losing 1st with SW. It's a huge achievement, even if its back now!
How much are you planning on losing?
Your journey is the opposite to mine! I plan on moving to SW, once I've lost most my weight. I have bren overweight my whole life, so I clearly don't know how to eat "normally". I'm going to go to SW to learn what to eat - but have pretty much accepted I'll have to stay on SW forever in order to maintain. (obviously with many flexi syn days!)
I hit week 13 tomorrow. It's tough, but time flies once you're on a roll! The weightloss has kept me going! I got through the first week only committing to the next hour on plan. Now I go week to week. Before every WI I decide whether I can stay on SS one more week. Takes the pressure off me.
Make sure you join some challenges and start a diary. It's helps. Also, someone is on this board 24/7 so if you're struggling - post - and someone will help!
Make sure you drink all your water. It helps with the hunger and headaches, as well as bumps your weightloss.
Good luck!