I sent over 0.2 btc to helix light, but I didn't take into account the transaction fee... The payment received on the site is now less than slightly less than 0.2 btc. Do I have to worry about my btc being lost? The transaction is being processed, but no confirmations yet.
No, you'll never lose you Bitcoin due to low transaction fees. It'll either take a long time to complete(8 hours to several days) or it will time out and the Bitcoin will be placed back in the original wallet.