please talk to someone NOW, well not now this minute, but tomorrow? HV or GP? Whoever you feel more comfortable with - no, talk to your GP. Anxiety is a classic symptom of post natal depression, you dont have to feel "depressed" i didn't but i was. The thing is, mine was missed and it festered. Honestly, nip this in the bud now - it will be much easier.
It might be that all you need to do is talk through your birth experience with someone who understands. I was traumatised by my birth but it was a "normal, no complications, natural birth" Still messed my head up though.
Your weren't able to bf - so, it didn't suit you - its fine, you are doing what is best for you and your DD. That is what matters, formula is there for that very reason and some mums choose not to BF simply because formula is actually very good for baby despite what the bf brigade say. Dont use this as another stick with which to beat yourself. I am very pro BF but hopefully sensible about it.
Take advantage of that lovely partner you have - TELL HIM how you feel. It is normal to feel overwhelmed and anxious when you have a new baby, but if it is regular like you describe i think you might need some help with it. There is no shame in asking for help, some women have this, some don't, more do than realise and suffer needlessly.
Good luck and enjoy your lovely baby xx