Ds's tongue tie was spotted in the hospital. I managed to keep breastfeeding with the use of nipple shields and was received to make it to the tongue tie specialist when he was just over a week old. It didn't seem to make any difference. Ds still wanted to feed ALL the time, but was told this was him making up for sleeping relatively well at night. Decided that sticking with nipple shields was fine if it meant that I could continue breastfeeding. Any attempt without caused ds to pull on and off and leave my nipple lipstick shaped and blanched. 
At his most recent weigh in ds has dropped from 50th percentile to 2nd. He is 90th for height. Though he hasn't lost weight, just gained very slowly.
I have been told to express and top him up every three hours. I can't keep up with the expressing and he is refusing the bottle. We seen the specialist again and he snipped more of his tongue. Still no difference in feeding. Was told he is probably just not a good feeder.
I'm exhausted. He is feeding all the time, but not getting enough seemingly. I finally managed to get him to take a small amount of formula yesterday and now he has really smelly wind and is generally restless.
I don't know what to do for the best. Do I persevere with the formula? How often and much do I give if its formula instead of breast milk? Is this the end of breast feeding for me? I feel tremendous guilt as I fed my first with ease for a year.
Sorry this is such a ramble.