There are many different kinds of yoga. Some yoga types should completely be avoided because it's quite rigorous. Others should be avoided because they are held in purposefully hot rooms.

Yoga instructors are typically very accommodating to physical limitations but you have to be the one who is aware that you need to stop following along and sit in "child's pose" until either the end of the class or until you can get back up and join in again.

It would be a good idea for you to mention what you're going through and recovering from to the instructor before the class starts, like at least 15 minutes before, if you can.

Also, I recommend yoga that is geared for cancer/MS/geriatric/CFS/Fibromyalgia/etc. patients - they have classes to specialize for people dealing with physical limitations.

They also have yoga classes called "restorative" and/or "relaxation" yoga that should be fine. Yoga for beginners might also be ok. It all kind of depends on the instructor and the class or studio.

I would also caution against doing all shoulder and head stands, possibly all upside down poses, maybe even "downward dog" until all symptoms subside. Women aren't supposed to be upside down in yoga during their menstrual period… and are typically given a different pose - it's perfectly ok and even expected that not everyone has the same ability.