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Hello. Thanks for the question.
It sounds like she may be painful. In a young small breed dog, back pain is a common sign of these vague pain signs. It's often due to a ruptured or herniated disc in the back. Most dogs are uncomfortable and reluctant to jump up or do stairs.
It may be GI upset as well. This can often look similar. Usually there is some nausea or diarrhea or decreased appetite.
I would probably just give her the night to relax and see if it resolves by morning. If not, then I would have her seen by your vet. If you want to give her something to help her sleep, you can give Benadryl. The dose in dogs is 1-2 mg per lb body weight. It can be given every 6-8 hours, as needed.
I hope this helps, let me know if you have any other questions.
I'm not sure why she's restless and panting. It may just be that she's anxious about something. I think a little Benadryl may be enough to take the edge off and get her to calm down.
If you're really worried, you could run her to an ER vet. It doesn't sound like an emergency situation, though, based on your description.
There's not really anything else in the way of anti-histamines/ sedation.
The rapid heart beat is also a signs of stress/ anxiety. Dogs will normally have a heart rate ~ 100-120 beats per minute. Up to 160 is not uncommon when stressed. If > 200, then I would get her seen, as that's too high and dangerous.
The most common signs of stress/ anxiety/ pain in dogs are: pacing, panting, trembling, high heart rate.