Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with your wee one today.
Did she start before or after the Benadryl?
Do you think she is coughing or gagging to vomit??
Can she keep water down?
Are her gums nice and pink (not white/pale)? Moist or sticky?
If you press on her belly, does she have any tensing, tenderness, discomfort, or pain?
Could she have eaten anything she should not have (ie bones, stones, socks, toys, plants, chemicals, humanmeds, etc)?