Spondylolisthesis and hot yoga

I’ve been practicing Bikram only for about a year but I’ve just been diagnosed with L5-S1 spondylolisthesis (along with a couple of herniated discs, slipped discs…) and my doctor told me that with the spondylolisthesis particularly, I should hold off on all back bends. I can’t find advice related to the spondylolisthesis particularly and I wonder if you have any suggestions as to whether I really need to exclude those frame practice all together or if there is some modification I can do.

Thanks!