hmm so much to go with here....
a bulging disk is best to lay flat with knees(and therefore feet) elevated. picture a s'more, well leave the chocolate out, your vertebrae are the cracker , the disk is the marshmallow. now pinch a side and the marshmallow would squeeze out the other side. welcome to a bulging disk. beware the side you "trapped " pinching the marshmallow as well.
flat and firm is the best way to take pressure off the disks evenly.
scoliosis is a lateral (sideway, think left to right) curvature to the spine. the spine curves 3 times in the body(not including sacrum) and these are front to back curves, the neck, mid back (usual scoliosis is here) and then lower back. with a scoliosis I think hammocking can aggravate it quickly ESPECIALLY if stretches and strengthening that were prescribed are not done regularly. if you have a large enough hammock for a true diagonal with no pressure to push the head and feel back to centre (of hammock), I would think a bridge hammock would be ideal for that, I am told it is a flat lay, no shoulder squeeze.
as for anybody with a body that has...hmmm...an infirmity, seek a good physical therapist, or medical doctor. preferably someone who isn't old fashioned as they would not understand us hammockers. there are many medical situations that aren't deal to sleep in a hammock, I do not believe scoliosis should be one on its own, but with the other.... changes that can occur from it....
I will leave it at that.
yes, I work in a rehabilitation hospital providing therapy...so the info is good.