Separation Anxiety at 5 months?

[First time mom.]

My 5 month old baby is breastfed but will take EBM from a bottle from anyone, as long as I am in the room.
However, on the few occasions I have left my daughter with my partner, she just screams for 2-3 hours until she eventually wears herself out and falls asleep and won't take any milk. I think she gets herself too upset and then refuses the bottle. She will also scream when anybody holds her other than me and my partner.
I have 3 ticketed events (approx 6 hours out the house) coming up that were pre booked and not sure what I am going to do. partner only had her for 2 hours last week and was awful.
partner says he can't look after her anymore while she's exclusively breastfeeding as he is unable to stop her crying her hours (says its because he doesn't have a boob!) but it really stresses him out which worries me! he gets really frustrated. I then say that I shall ask other family members but he declines as he doesn't want to look like the bad parent who can't cope. however, I also feel.like I really want to go to these events for some ME time as I never get a break.
so he is saying we need to give more bottles like 3 a day which I don't want to do as that is a lot of expressing and time! and he takes a bottle no problem off my partner most evenings!
spent the whole night crying as just not sure what to do, feeling like I am just going to have to be with her 24/7 and cancel these events but for how long!
I have just come here for a rant really and to see if anyone has had any similar experiences for advice. it is causing issues between me and partner too which I hate.
thank you for reading my essay

I can understand you wanting to have some time away.

Does your DP look after her for a while after she's been fed? If not, I'd start getting them to spend some time together after you've done a big feed. Sounds like most of this is a confidence issue.

One thing that helped us was feeding DD from a cup when I was out. I think the novelty got her to drink a little. She still sobbed sometimes though.

How old will she be when you go to the events?

DD1 went through horrific separation anxiety from 4-7 months – she had to be able to see or feel me at all times, would grudgingly tolerate merely hearing me for a few minutes. For us, it wasn't just about DH's confidence, since she was the same with anyone who wasn't me (and when sleeping, she could fall asleep just looking at me, but could only stay asleep if she was touching me, since of course her eyes closed and she could no longer see me).

You could try leaving her with another family member whilst you and DP do something together. Then it's not a matter of him not being able to cope, but of you having some time as a couple, and it would let you see if it is a confidence issue on DP's part, or if it's baby. We were advised to try me going out little and often, rather than rare, long events, but I think mostly it just took time. Sorry, that's not going to be what you want to hear, but DD1 really was pretty extreme.

The lack of time to yourself is brutal. We found she did best first thing in the morning – she could usually manage an hour with just DH right after waking up – so trying different times of day or activities might help (DP taking her for a walk or giving her a bath, perhaps?).