Can't eat, throwing up, no appetite, help!

Mental health
1

So about 2 years ago, i suddenly couldn't eat or drink anything. It came out of the blue, no warning. I woke up one day after not sleeping almost at all and threw up. I tried to eat but had no appetite and felt very nauseous. This lasted a long long time, I went to a psychologist for 3 months which was no help and then a psychiatrist for about 8 months now. With time, after about a year and a lot of diazepam and anxiety medication I eventually overcame the disorder almost completely. The last few months were the happiest I have ever been. But the happiness was short lived. Two days ago I woke up, threw up and felt the worst loss of appetite I had ever experienced, every time I take a bite of food I have to lay down and meditate to keep it in. It takes me hours to eat a small meal. I am still on the same medication and am very worried about this. Why did it come back? What do I do? I'm dehydrated and hungry but can't eat or drink. Also it's worth noting the feeling of strong nausea never fully went away even when I was feeling OK, every time I had to leave my home to go somewhere I felt really nauseous but it was manageable.