First post, struggling feel like im just rubbish at this lately

[Cjjm22]

Hello im jo this is my first post.
First time mum, babies 23weeks just over 5 months today.
Always had a probiem with feeding, he struggled to breastfeed, ended up with jaundice and crystals in urine in the early days, we got forgotten by the hospitals so saw no one til he was 11days old by which point we successfully introduced bottle. I continue to express now.
Growth spurt hit and he struggled with bottles, he was between teats but eventually took to size 2s. Started sleeping through the night after taking 850 - 1000ml during the day.
Then christmas we all got covid, his last jabs were delayed 3 weeks, we hit sleep refression, growth spurt and start of teething. Now hes fussing over the bottle having 60ml here and there, srarted breastfeeding again but only at night, wakes every 1-2 hours and sometimes awake for 3 hours with nappies and feeding and im exhausted and feel like im just getting in all wrong.
Is this normal or am i at fault?

Sounds like you've had a rough start and with Covid added in, it's no wonderKO is a bit if a handful.

If I'm honest, I'd see the GP and ask fir them to check his throat, ears and tummy to see if there is a reason they are refusing feeds.

I'd also try a teething gel like Dentinox before bottles.