This might not be the right place for this but please I just need help.

My GSD gave birth to 11 puppies and now there are only 3 left. The rest had convulsions and kept foaming till they stretched and died. I've not slept in over a week now cause they cry throughout the night.
Took them to this vet. Vet said it's something respiratory and she administered injections but refused to tell me what she gave them, 2 died the following day and one has dropped everyday since then.
I've given them coconut water as I suspected it light be poisoning but nothing. I tried palm oil but still nothing.

Please I beg, anybody that has experienced this should help me. I don't want to lose all 11. As I type this, one is already dying.