New posts are ones that you start a conversation/ question for people to answer. There is a text box at the bottom of each post that you can use to respond to other posts. I hope that helps. Welcome to PC.common acronyms used here:

IOP - intensive outpatient therapy or partial hospitalization program.
Pdoc- psychiatry
T-therapist
Also a lot of people's medication is the same but called a different name depending what country you live in.