No weight gain with Buspar, no decrease in libido, really had no side effects at all. Buspar has worked very well for me when all else failed. AD's never helped me. Buspar got anxiety under control which in turn depression went away. Very happy with it. As far as losing the extra pounds here are some suggestions, though not always easy to follow:
Stop eating out
Eat less overall
If exercise is a dirty word, walk everyday, it helps
Do not eat anything 2-3 hrs before you go to bed
Don't drink beer, it is full of fat and goes right to the mid section
Lots of water, limit sodas to one a day
One sweet treat a day, snack on Almonds if you like them
I lost 16 pounds doing this when I gained alot of weight on serquel. Back to a good normal weight for my height and build.
Good luck, with a little eating style adjustment, you will be able to do it.