Recovery is a long and hard process. It's not going to happen overnight, and some will have a rockier road than others.
Nobody expects you to start recovery and it be plain sailing, and you should be aware that there may be slip ups too. Sometimes it's two steps forward, one step back.
Starting to eat on a new plan is scary. You feel full all the time, maybe a little bit hot and sick, moody, and the chances are that you are having to eat foods you don't always feel comfortable with. It's not unrealistic that you will at some point panic and feel overwhelmed. You're losing the control you once had.
The key is to trust those helping you. Maybe someone is preparing your meals for you, or you have been given advice on what to make for yourself. Those people are not out to get you, they are helping. Food is like medicine, and sometimes it isn't nice.
You will have good days and bad days. A bad day does not been you have failed, it's just a blip really. Talk to someone about it and make sure family and friends are aware that you're struggling. Then you have to make a promise that tomorrow is another day, and you will start again. Make plans to do activities for at least the next week. Things you enjoy can distract you from the eating, and show you how much fun you could be having.
The earlier you act on a relapse, the quicker you will be able to get back on track. Talk to a professional and any family or friends you have helping.