My daughter is/was AN-R. She is in recovery. She developed tachycardia when she was restricting and it never resolved. However, she sustained a skull fracture and concussion that the POTS doctor thinks has contributed to the POTS, more so than AN-R. On the flip side, if you talk to an ED expert they say that the ED triggers POTS. She never had POTS symptoms until she fell and got the skull fracture. I think both have played a part.