Is my breastmilk making my baby sick?

[Applecrumble0110]

So I'm EBF my second baby. Didn't manage to get to day 2 with first because genuinely had no colostrum and caved in when everyone said DC1 was starving and gave formula. Everything bfeeding related is new to me.
I have a 5 week old and he's gotten a little poorly and the Dr said its his mucus cough making him throw up but HE IS PROJECTILE VOMITING EVERY SINGLE FEED. EVERY FEED. I've been awake for 4 days straight with 1 or 2 hours sleep a night because he chokes on his vomit if laid down so me or DH hold him up but I can't rest knowing he's unwell.
Now I'm starting to wonder if it's something I'm eating? What foods helped your bf baby not have reflux/vomiting and what foods triggered it?

So nobody has mentioned this and I'm assuming because there is consistent weight gain and no dehydration in baby. I have looked at the symptoms however and he seems to have some e.g. projectile vomiting then hungry right away

Came to say this. Projectile vomiting for my baby was the sign they were coming down with, variously, COVID, RSV and noro.