I'm going to pop this into the labour forum for you
Second labours are generally much shorter than first labours so it is unlikely that you will be in labour for so long. Being upright can help with the length and ease of labour so that is something to keep in mind.
You can help your DH/DP (other support people) help you by telling them the ways in which they have to be your advocate. They can tell the staff not to take your baby away because you want it to stay with you. They can tell the ob that you don't want to hear the c word until it is 100% nessescary and so on.

You don't need to feel like you have no right to be upset because other people had worse experiences than you. Just because you think someone else had it worse than you that doesn't mean that your pain isn't valid. if we all followed this thinking then no-one would be able to own their pain because there is always someone worse off...