Poor you, from experience its not uncommon for lots of women i met through blooming awful (ba, website for hg) to get pnd so you must look after yourself. IIRC the ba founder gave up after severe pnd indeed.
Advice is to choose things that you don't need to do post baby- you can build associations with the nausea (Psych prof assures me tere is a medical term for this, I cant recall it). For example my pram choice was limited to ones I didnt see with hg, the colour terracotta makes me feel queasy almost a decade on...
rest is all- there was talk at one point of a limnk between nausea and hg but not active for ba any more so not sure.
tbh i was about a month after birth before i got better with ds1 (the only admission) as pg itself is hard enogh- with the other 4 took maybe a few weeks once on meds