Weird experience during meditation

I had a weird experience couple of days ago while doing meditation, I hope someone more expert than me could help me understand.Two months ago I started practicing 30 min of yoga and 30 min of mindfulness meditation daily, everything was going good and I felt some changes in me, little by little, I felt I was becoming kind of more aware of myself and my thoughts were slowly become less strong in my mind as I was slowly able to focus deeply inside myself. The other day while I was in a deep state , without thoughts I felt something at the bottom of my spine become hotter and hotter and all of a sudden a warm powerful energy moved upward my back. I immediately felt an intense feeling of ecstasy (as I would take drugs), my head started to spin and I lost balance. Also I had a strong sense of nausea and I had diarrea. I also felt that something was released at the level of my hips. At that point I got really scared and I opened my eyes but the feeling was still there, I felt really peaceful , complete absence of thoughts and like if I was completely extraneous of my body and nothing in life was really important anymore. Also I noticed my senses were a lot more accurate. That feeling decreased a bit over the night and the day after I wakes up completely in hang over, and I remember I could see the colours a lot more bright, and I was really sensible to light. I got really scared From this experience and I’m not able to do meditation anymore , I feel like that if I dig a little bit inside me I can “touch” that energy again but I don’t want to!can someone explains what happened to me ? Sorry for my bad English , I’m not native English speaker. Cheers