I’ve just read your post on the new baby thread too Green, but replying here rather than on both.
If you’re struggling with latch and she’s getting very windy from formula have you had her assessed for tongue tie? The quickest way is privately. Your HV/GP/MW can’t assess but they can refer you and may do it as your BFing but if you’re formula feeding and baby is gaining weight the NHS care a lot less.
Re cluster feeding from the other thread - just go with it. If she’s full she won’t eat but around 4 weeks there’s a growth spurt so she will definitely be hungrier. If she’s struggling with wind a drop of infacol or gripe water can work wonders. I wouldn’t change formulas just yet. Which one are you using? And which bottles? Do you have anti colic ones like MAM or the Tommee Tippee ones? How’s her latch on them if she’s struggling with latching to BF? Have you looked up winding techniques? We found the “magic burp” most effective when he was small - where you stretch them out to wind. Others find holding them upright wiggling their lower body helps. There’s lots of different ways and you may find a different one to the one you’re currently using works magically for her. Have a look on tiktok or YouTube
Magic burp:
Constipation is common in formula fed babies but depending on which formula you’re using ready to feed versions often help them to go. Baby R has always been a once a day man but if he doesn’t go I give him a RTF and a foot massage and it gets things moving. There are certain points you focus on - lots of videos on YouTube or guides if you google
Also look up the witching hour to reassure you the evening chaos and baby melt is normal. It’s definitely not an hour
And finally you mentioned your low mood on the other post. Please speak to your MW or HV. They can refer you to the specific maternity mental health team and they can help.