giving up at 3 weeks, giving in too early or tried my best?

[sprite25]

I've had various problems with BF from the start but even at its worst I've carried on. My decision isn't based solely on one night but after a really awful night with DD last night I really feel like I just can't do it anymore. Besides the physical benefits of breast milk, I don't feel like its doing either of us any good. DD seems constantly unsettled and I feel stressed and in pain, I don't feel like its helped us bond at all. I will still feed her from me when I feel I can and express as much as I can to give her while its still there but I can't help feeling like its just not working out. Is 3 weeks too early to make that decision? Is it long enough for her to have long term benefits of breast milk? They say happy mum = happy baby but on the feeding side of things im just not. Gave her a bottle this morning and despite only taking 2 ounces she's zonked out and let me put her down in her bouncy chair, she's NEVER like that even after hours of BF.

She did have a tongue tie which was sorted out at a week old, but I think that plus all the methods of feeding she's had since she was born haven't helped (nipple, nipple shied, cup, bottle and a dummy). I will ask MW or health visitor to check for thrush, just to rule it out as DD has a white film on her tongue, fusses at the breast recently and I have pain in my breasts even after a feed or expressing (all symptoms of thrush) :(