Supplementing with formula?

My baby is tongue tied, explains why she doesn’t latch well and wasn’t getting enough milk. I’ve been pumping and feeding but it’s so exhausting. I feel like a failure. She’s also having a lot of gas pains and I’m worried it’s me.

I’m supplementing with formula and she seems satisfied. Then I pump and store and feed her breast milk every now and then.

My question is, will it hurt her or upset her more?

What should I do? I’m getting her tongue tie clipped so she doesn’t have problems now or later in life, but until then, what should I do?!