Hello, my daughter is 3.5 months old. She's constantly crying. I don't…

Hello, my daughter is 3.5 months old. She's constantly crying. I don't have any strength left. Her tummy doesn't seem to hurt anymore. I've given her everything and done everything I can. I just don't have the strength. She keeps crying and it's very difficult to calm her down. Plus, she might even start trembling in her hands when she cries. We saw a neurologist, who said it will pass by three months. Nothing has changed. An ultrasound of her head was done at one month. Everything is clean and good. Maybe we need to do some other tests? I don't know anymore. I just don't have the strength. Someone says it