I made a bitcoin transaction from btc core to bittrex with quite low fee, yet looks like it went through in 4-5 days, now I have it "sent" for 2 days but I still can't see it in my bittrex balance... is this anything to worry about or is the network this goddamn busy or something?

Would some experienced person help me with this?

I've sent 0.02395847 BTC from BTC Core to bittrex 4 days ago, I don't know anything about fee / transaction speed relationship, I just wanted to survive it relatively cheap, like 10-20$ (Transaction total size: 487 bytes)

So today the transaction disappeared from bittrex "pending deposits" table but I didn't get it and it's still unconfirmed... after reading around the web I guess my fee was too low... do you think the transaction is stuck? What is my best chance? Does it get back to wallet if I wait? How much I need to spend for a goddamn ~300 bucks to get it through for real....... this whole thing just makes me upset

Thank you for anyone's hlep