Depressed, feeling like a complete failure

I’ve reached out about my feelings to my husband and family, and they all trying to help but I just can’t shake this feeling of being a complete failure of mum to my son.

He is 14 weeks old, has severe allergies and has gone through probably 10 different formulas to finally get one that’s suits him.

In the process he has lost his trust towards the food and bottle. So he won’t feed whilst he is awake which is heartbreaking to say the least.

I feel like I fail him everyday as a mum cause I can’t make it better.

And I didn’t have supply to breastfeed and with such strong allergy it would not have been recommended to breastfeed.

I just dont know how to help him eat again, he is currently taking 1/3 of his required intake and we’ve been told if it doesnt improve he will have to be tube fed.

I’m a first time mum and lately I cannot help but cry at feed times, I’m feeling very helpless and sad :( please if anyone has any recommendations or experience with previous babies help with advice