Have you tried swaddling?
Have you tried a dummy?
Is baby getting enough daytime sleep?
For a newborn, recreating womb-like comfort conditions helps. The womb is a cramped, tight space where baby is quite tightly held with restricted movement. This is why babies like to be held. It is also why many value and love swaddling (especially around the arms and shoulders, less tightly around the legs because of leaving free hip movement) - it recreates womb-like conditions
Your 10 hours of cluster feeding sounds less like feeding and more like a baby who sucks for comfort. Again completely normal, the sucking reflex is relaxing, soothing and comforting for a baby. Giving a dummy to suck instead of your nipple frees you up somewhat. Especially when teamed with a swaddle so that you can put baby down.
More sleep leads to better sleep. It is not unusual that a baby this tiny could sleep for 16-20 hours in 24. It might be that baby's only awake time is for a feed and nappy check, then straight back to sleep. It really might be only 20 minutes awake time between one nap and the next:
Sleep
Wake
Feed, Wind
Nappy Check
Feed again to make sure tummy is full
10 minute winding cuddle and back to...
Sleep (and so the cycle begins again)
Over-tiredness can cause quite significant problems because an over-tired baby will struggle to get to sleep, will be a lighter sleeper and so will wake more easily. Therefore ensuring baby has limited awake time (probably around half an hour at this age) between one nap and the next can make a massive difference to the quality of their sleep.