Coffee withdrawal symptoms

Hello, I have been drinking coffee almost every single day for weeks, if not months now. I stopped drinking it about a week ago. Then I started feeling anxious and trouble sleeping. I haven’t slept for 2 nights already. It was hell. My brain felt active but my body felt tired.I legit tried so hard to sleep and I couldn’t. This is rare for me. I even took melatonin and it didn’t work much. I even called in to work. I tried to work today but I felt drained and left early. I had half a cup of coffee today but threw it away. Has anyone else experienced this? Do you think it’s coffee withdrawal? If so, any advice to feel better and to finally sleep? Thanks for reading.