Oh my God, yes! How frustrating! Good for you that you're sticking through it; it will get better! BOTH my boys were tongue tied (thanks to my genes). I noticed the moment my first was born and the ped in the delivery room said, no, it looks fine. Well, I knew better than that, but didn't want to undermine a Dr. so I did nothing about it and suffered thru bouts of bad breastfeeding. Then my second son was born and I had a horrible time nursing him, too and took him to an ENT Dr. who snipped it right in his office. Unfortunately, he was accustomed to nursing the "wrong" way and it took some work and a little pain to continue nursing him. My oldest son was 18 mos when the younger one got his clipped and I decided to the older one's done, too. Because of his age and the thickening of the tissue, he had to go under at the hospital for his procedure. I highly recommend doing it NOW rather than later! Double check your eldest, also. Trust me. My dad wouldn't let me get mine done and my mom finally took me to get mine snipped at age 17. Ick. And I talk with a slight lisp at times, although that's gone away a lot since having it done 11 years ago. Much easier to do it now while it's thin and short. It is hereditary, my little half-sister had it and I convinced my step-mom (who was in horrible pain nursing) to get it when she was 7 mos old. Just keep introducing the breast, pump if she won't take it, and see a lac consultant if you continue to have problems. Good luck. You're doing the right thing.
C.