Well i just made a double spend and payed a 101 satoshi per byte fee, now i do regret and wish i would pay more fee but im still not totally understanding how much fee i should pay.
And somebody mentioned before that Viabtc will not help with double spending.
yakuza is wrong. 101 satoshis per byte isn't too small, just below the recommended. Your transaction should still be confirmed within the hour. I sent this tx[1] with ~80 satoshis/byte an hour or 2 ago, and it confirmed within 5 blocks. ViaBTC should still be able to confirm your transaction if you submit it there.
[1]
https://www.blocktrail.com/BTC/tx/3c6ae9d94cefb0f10fad3ef6291d5d924ede8711cb2ca78330ee8db7920c353c