My husband has tongue tie but not so bad that it gives him a speech impediment or problems eating. Considering the degree of immobility your baby has with the tongue-tie; you are doing the right thing and your child will be so much better off in the future. They say it isn't as painful as we think and it heals very fast (usually oral wounds heal pretty quick...depending on what is going on of course).
Tongue-tie TongueTie - Surgery
Some think that the 13 is actually a lucky number...maybe babe will start saying words when it's all over and healed!
Good luck!