I don't know if it's worse in bf babies...some people say the opposite too! To get through it, we played lots of peek a boo to reinforce the idea of object permance (remind her that even when you can't SEE things, they are still there). When she's on the floor and fussing, I try to come down to her level to comfort/distract, rather than always picking her up - can't always be "rescued" that way. When I leave her sight, I talk to her or sing, so she's reminded that I'm still around. Works pretty well for daytime. I notice your lo is about 6 months. I found separation anxiety came and went for a while at that age, but for some moms it comes back with a vengeance after one year old for a while!
As for nighttime...I'm not a good one to ask. My lo still frequently ends up sleeping for the last part of the night/morning with me... :oops: