I did a transaction from my bitcoin core wallet. The transaction 6263452f635713e60f83d45fe41b1c9ba3b5f5e3af664778bf18a05b15cfde06 has not confirmed, and it is now over 48 hours since I made the transaction. Although blockchain.info will show the transaction (as unconfirmed) if I enter the transaction ID directly, it no longer shows it on the "unconfirmed transactions" page, https://blockchain.info/unconfirmed-transactions.
What should I do now? I am a complete newbie - this is my first transaction, and this has been very frustrating.