No advice just a big my 20 month old is going through the same things, she has an ear & throat infection and had a fever for 2 days, wouldn't stop sooking and didn't move off the couch.
She got the fever shakes and scared the crap out of me.

If BFing settles her and keeps her comfy then def keeps up the fluids that way, lots of cuddles and boobie love and hopefully she's better ASAP for you.