It’s a marathon, not a sprint. :) That’s the biggest takeaway from this as it’s a total lifestyle switch and not a fast solution diet. That being said, congrats on completing your first week!
Jumping into OMAD is a very big lifestyle switch, a lot of people switch to a 16 hour fast, 8 hour eating window and get practiced before moving up. Be kind to your body :)
No matter what your window: 16:8, 20:4, One Meal a Day, make sure you stay hydrated and with electrolytes. Your best bet is to go to the top there and hit the Wiki link to start your reading on electrolytes and other questions asked about the fasting process.
I read a lot before diving head first and still do about a year later, day after day. It’s a work in progress and I’ve just gotten the rhythm that feels right for me.
Be kind, drink water, get educated! And don’t push yourself too hard. :D