I sent some bitcoins to a new wallet that I have but I set the network fee too low(I know, I'm an idiot). It remained pending in there for 3 days then disappeared.

I've read that it will eventually be forgotten by the network and return to the original wallet and that that the transaction may not appear in your wallet but you will be able to send them again with a higher fee.

Is it just the transaction that may not appear? You will still see the bitcoins come back to the wallet?
 
Is there a possibility that they may never return?



I would appreciate anyone's help on this.