It happens. The body is going through a tremendous change. I ended up with severe posture issues.
I went to PT to focus on standing up straight.
Fortunately, I didn't really have a balance issue.
Your body has gone and is continuing to go through a tremendous change all for the better.
So, the balance thing will come eventually for you.
You have to retrain a little and work at walking with good posture, etc., etc.
Best wishes,
Ralph