Hi Karen,
Welcome and I am glad you're seeking support.
Congratulations on Day 4 and it sounds like you are doing well - grumpy and light-headed was the way I felt at that time too.
I think one of the reasons recovery is so hard, is because it shakes up everything in our lives. Yes, your friends might eventually stop inviting you out, and that would be disappointing, but at the same time, it could open up something new and signigicant in your life.