So I tried to astral project first time and it went good. I was relaxed, I didnt move my body at all. I started seeing white or something like light yellow and I felt electricity over my body. I heard something between high pitches and vibration. Then my heart started to beat faster and my breathing became shallow amd fast resulting in me waking up with a huge headache. Any tips?
This tends to happen a lot,I felt the exact same thing when I tried for the first time. It's not an easy thing to achieve, in fact, it takes years for some people. What you experienced was the 'vibrating' stage of astral projection, which is the last stage before detaching, keep practicing and you will get to your goal. Patience and practice is key.