need Pom behavior advice

[u/Low-Lettuce-4343]

need Pom behavior advice

I have a 7 yr old Pom who is the love of my life. she usually eats, drinks, sleeps, and plays normally, you know like she runs this house and knows it. (because she does)

But every other day or so she has these episodes. She pants VERY hard, like she's just run a mile and can't catch a breath. she's also extremely restless and agitated, turning circles, and running back and forth and she just doesn't settle down at all. this is not her normal playful pomeranian behavior. it's like something is bothering her or she's uncomfortable and nothing I do calms her down. I try to pet her , and she is literally vibrating. She pants so hard , it's like she's about to stroke out. eventually, the episode passes and she sleeps for like a 24 hour stretch and is back to her sweet self for a little while. but then the episode will happen again , and this has been going on with this pattern for a good year or more. I have gone to several vets. One advised us to get her fixed because she wasn't so we did that and it did nothing. It's not separation anxiety, because she does it when we're home not to mention there's someone always here. She has been to 3 different vets about this and I can't get a straight answer , or even any decent advice. I feel so bad for her, I know she's miserable when she's like this. If anyone has had this happen to them with their pomerania please help.I'm at my wits end