Vets again and more upset

Buster refused his supper last night. This morning he got up and had a small drink of water and threw it straight back up. Got Ang to come over when she rang at 8ish but she had been up most of the night drinking. Rang vet at just after 9 and got appointment for 12.20. Went to shop for Ang to get cider and then got both of dogs out to railway station. Buster passed lots of tarry poo. Taxi was 15 mins late but got to vets only 6 minutes late. Vet saw Buster mood was improved as it was same vet that saw him the first time. She game him an anti sickness and antibiotic injection. She also sent me home with more of same tablets as before but with different prescribing. He has 1 tablet 4 times a day now instead of 2 twice a day. She also sent me home with a can of i/d food to try and get him to eat. The bill was just over £71. I walked him home and on the way he had 3 seperate poos which were a reddy brown in colour and really liquid. Got him home and after 3 attempts over next hour and half manage to get him to eat a third of the can of food vet gave me and get one of the tablets into him. Am really relieved he has eaten something again and got tablet in him. It's nearly 5pm now and am gunna tray him with a little more food about 7 with another tablet afterwards. Just hope he pulls through. Ang left after I got back because she was drinking. About an hour later she came over asking for her phone. I told her she took it with her and she stayed for a rollup the left quietly. 40 minutes later she came back and went mental demanding her phone and the tried to attack me. Buster went mental and I managed to quickly get him in the bedroom. Luckily managed to get her out of the flat and she shouting at me from the path that I was mental and needed locking up. When she went back to hers I let Buster out the bedroom and fussed him loads. That was the last thing he needed.