I have a 9 yo OTTB mare who has recently started throwing her head almost constantly. She is retired due to some issues with her neck/back, so is not ridden (and hasn’t been for years) and pretty much lives outside (comes inside during bad weather).
I have checked her ears, hosed her off, fly sprayed her. I looked her over for ticks, we have EPM and Lyme tested her. She wears a fly mask at all times when outside. Whether she is in her stall, in the paddock, has a fly mask on or doesn’t she is throwing her head up and down. I am unsure if this is at all related, but she has also started pawing in her water trough to the point of tipping it as if in a way to get her legs and body wet. Then she will have moments where she just like loses her mind (?) and starts galloping around like crazy. I eventually can get her to settle down, but she seems to be spiraling.
I have had this mare 4 years and she has had nothing but issues, countless emergency vet visits and we just can’t figure her out. I truly feel like I have tried everything for her. I have 3 other horses that are all happy, content, no head throwing, etc.
Any ideas on what could be causing this?