When I had mastitis and couldn't feed cos it was too painful, and didn't want to cause nipple confusion by using a bottle we did a "finger feed".

You get a small tube and put one end in the milk (in a cup) and one end alongside your finger and then put the finger in their mouth to suck (facing up so nail down against tongue). As they suck they draw in the milk through the tube and feed! You just need to make sure you have clean hands and no nails!

I'm not too sure where you'd get the tube to be honest- a lactation consultant gave us ours, maybe a pharmacy??

Not ideal I guess but worth a try if you're desperate

Good luck!