Does anyone know what could be wrong here?

Since last night (so about 24 hours) my dog has been coughing and choking, gagging and heaving. It's like she has something stuck in her throat and she can't get it out. She's been on her normal two walks today. One this morning and one this arvo, both lasting around an hour. She was fine on the walks, ran around like usual and did not choke. She has eaten 3 meals since the coughing etc started which have consisted of a little bit of kibble along with raw mince meat, raw egg and a bit of dog meat. All of which the dog is fully used to eating. She's been consuming water normally, she may have even drunk a little more than usual but lot excessive amounts.

She will be fine for ages and then she'll start coughing and choking, then she'll sit up and heave and gag. I don't really know what to do but I think I will be taking her to the vet tomorrow, I was just wondering if anyone has an idea of what may be wrong with her.