Aww mama, I understand how stressful this must be, banyak switching formula and baby still not doing well is really concerning, especially with the mucousy vomiting and slow weight gain. Definitely have a chat with your paediatrician about this because it might be something more than just formula sensitivity, and they can help rule out allergies or other issues. For the milk sharing angle, try posting in local Kemaman mummy groups on Facebook or WhatsApp, a few of us mums have found donors through community groups and breastfeeding support pages, so ada chance you'll find someone nearby who's willing. All the best, mama, semoga baby gets better soon!