Baby keeps throwing up:(

My little one is 9weeks old. She had her shots Fri it's now Tuesday. The past 2 days she hasn't been really hungry and if she eats she throws up the whole meal. She's breastfed but today twice so far and yesterday twice and once on Sunday. It seems to be if she eats for more than 10ish minutes. Typically she will eat longer than that. Any ideas why? What to help? I don't think she's just too full, but maybe? She's also been sleeping a lot less and crank during the day she doesn't want to nap the first 2 days after the shots she slept nearly all day and woke up to eat