I've been exactly where you are. My insurance changed its requirements literally the day before my surgeons office submitted my paperwork. So when I should have been through I had to prolong the surgery even more and do 3 months with a dietitian.
Now this is just me...I'm weird like this, but every month I went back to the dietitian I had gained weight. It literally made no sense because I was doing what they told me. They said only drink water, I did. Eat more greens, I did. Exercise, I did. Replace meals with protein shakes,I did. Eat three protein rich meals a day, I did. You get the picture. My last visit and she says to me "what are you doing different? You're gaining" I said I'm doing what you told me...what everyone says you're supposed to do. Needless to say I left that day in a funk, I was sure insurance was going to make me do another 3 months...I worried for nothing. 3 days later I was approved. I know everyone's insurance is not the same, but if I were you I'd just stay positive about it. And don't beat yourself up over gaining. After my last visit I stopped following the way the dietitian told me to eat(meaning I started having juice and eating less than 3 meals ) and I lost pounds...not advocating that everyone, I'm just telling my story.
Anyways good luck to you,I'm sure everything will go through fine.