Working on L2 and Got H1B Visa.But don`t want H1B

I am working on L2 EAD valid till Feb 2014.But appled H1B visa in April 2013.And It got approved.But in The mean while went for Maternity leave for 3 months Aug ,Sep Oct.Now Joined Company who applied for H1B in Nov.And searching for Job.

  1. But I don`t H1B now and want to back on L2 waht are the options?

2 ) If I go to India in Dec and come can I use my L2 visa or need to go for stamping

3)If I will go for stamping do they cancel me L2 visa too if H1B rejected