So my 2 year had to get a cap on one of his tooth last week on Monday and ever since then he has…

So my 2 year had to get a cap on one of his tooth last week on Monday and ever since then he has been fine. We went back for a follow up appointment today and he has a infection in his mouth now. He is in so much pain and will not eat or drink anything (not even breastmilk). I feel so bad for him. My boobs hurt and we have tried everything and nothing is working. Omg what do I do. I can hear his little tummy screaming for food.