Many thanks, I have checked again (in my bitcoin core client  Version v0.15.1 under "transactions", where I find a table with transactions. If I click into the line of the transaction, I get a pop up window with details for transaction and then I have just copies it: f19c7aadb0a20717e0526778615e71d7288c1ce8d3dacbac37e18fb3ea270da4).
Should I check within the console (what's the command?)
I tried push the txid (have converted it to raw hex format before) at https://live.blockcypher.com/btc/pushtx/ and there
I get "Error validating transaction: Transaction [... the ID above ...] orphaned, missing reference.
Does that help? Can I make it untuck or get my coins back in by bit core wallet?

Here is my transaction I started from bitcoin core on December 19 with a fee of 404 sat/byte which was fine then for going through within 6 blocks.
f19c7aadb0a20717e0526778615e71d7288c1ce8d3dacbac37e18fb3ea270da4
However it has not arrived yet, and what is worse, is even not known/shown - I checked with blockchain.info and blockexplorer, which worries me.



How can this happen? Where is my transaction (in orphaned blocks?) How can I get it unstuck / or if neccesary withdraw it/get it back?
Any help is appreciated, I will spend to adress given above or the one the helper gives me.