Hi, your LO won't take a free flow sippy or a regular cup either? My DS wouldn't take a bottle until 11 months, but he would get by on a sippy once and a while. If your LO won't take a bottle from you, is there someone else that could take over feeds? DH usually had more success that I did becasue DS's brain associated "Mama=BF".
I am not sure what an HV is, but if it were me I would step back for a bit if I had the time, and let it settle, then have someone try with a sippy of EBM when everyone is feeling calm and relaxed, and you are not in the room.
TBH I didn't fight the bottle refusal much, reasoning he would get over it eventually, but i had the time to do that. Hopefully someone else can help you more!