Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 16 years of experience. I look forward to working with you. I apologize for the delay in an expert responding.
With this many seizures I think it unlikely it is simply due to the heat. If this was heat stroke then she would have progressed to having other symptoms and this usually requires an emergency visit (can be life-threatening). I would be much more suspicious at her age that this reflects a primary cerebral (brain) problem such as stroke-type event, hypertension (high blood pressure), liver disease, toxicity (especially lead), or tumor. Certainly there are other possibilities such as infection (fungal, tick-borne bacterial, parasitic) but we more commonly see these in younger dogs. Epilepsy is highly unlikely as this usually starts in young dogs and then is life-long. If she has had seizures her whole life, then epileptic seizures are possible.
For the head/nose pressing this may indicate a headache or be one of the abnormal behaviors that comes after a seizure. With this many seizures in such a short time frame her brain has probably not had a chance to really recover, which can lead to some bizarre abnormal, possibly repetitive behaviors.
There is not much you can do at home. When a dog is cluster seizing like this, it requires an emergency visit for intravenous medication to stop the seizures. So, if you want to wait until your vet opens, please get her in as soon as you can for this treatment, and then likely plan to leave her there for the day for monitoring for more.
She is going to need some testing to look for our more treatable conditions which may require lab work (CBC, chemistry profile, urine check, tick-borne disease screening) and blood pressure evaluation.
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