I lived with a lot of pain at my most severe state. Some other symptoms that later I realized were likely related to low blood volume like being unable to stand for very long.
I felt like I was vibrating, was light-headed, face would go numb for instance. Standing for long would also leave me panting for air. All of this was also related I believe, to very low energy stores.
I'd run out of steam really quickly and it would take time to restore. Lots of time in bed resting and sleeping.