Heatstroke is a life-threatening emergency. Common signs including panting, trouble breathing and collapse/fainting. It is important to get help from a vet ASAP.
Many different house and garden items can be dangerous for pets. It can sometimes take hours or days for your pet to show signs of poisoning/toxicity.
Being unable to pee is a life threatening condition. If your cat is unable to pass urine, this could indicate a blocked bladder. Call your vet for advice ASAP is having trouble peeing.