Kina

Mastitis is the bloody worst and it's understandable that you're feeling down. Boobie problems can really make you feel terrible on top of baby blues, you're doing fantastic and should be so so proud of yourself! Well done for keeping it up, it's brilliant that she's still the same weight as a lot of babies lose weight (DS lost about 4oz and went down to 5lb 13oz).
Warm compresses, lots of drinks, feed plenty from the bad boob, compressing your breast in a warm bath can all help with mastitis.
You're doing great even if you don't feel like it

Lucy

Kx you're doing a fab job. Olivia lost about 6oz and took 10 days to put it back on.

The cabbage leaves sounds bizarre don't they but they really do work and will make your boob feel a lot more comfortable. Make sure you feed from both sides (no need to not feed from the boob with mastitis) and I hope it clears up soon.

I wonder what size sling you would be? I'll pm you.