Vomit

My 6wk old has had a snotty nose all week and I’ve been treating it at home with saline. She’s feeding fine and otherwise no breathing problems. Over the last few days she’s had an increase in sick episodes which look stringy - mucus like cottage cheese. I’m guessing it’s mucus from her cold and semi digested milk. Today it’s amplified to throwing up this as well as a water like vomit. There is a lot of it, to the point where she’s distressed. She’s not napping well and waking up to be sick too. It’s too late for a GP appointment and are now closed for Easter. I called 111 but the automated voice says not to call for children under a certain age. I am worried that she’s not keeping her feeds down and she’s distressed. Who do I call for advice?!!