Have I Called The Wrong Type Of Angel?

I've always been interested with angels and my nan always told me stories about Guardian angels when I was younger, so a few weeks ago I searched it and wanted to know how to see and communicate with them I found a trustworthy website and it said to relax and call out for my Guardian angel and that it will come to me, so I done exactly that but when I something started to happen I felt sick, scared and started to panic so I stopped just in case I'd done something wrong, I felt a jolt go through me and I fell off my bed, where I was laying. I tried to forget about it but since then I've felt things touching my back, like resting a hand half way down my back, hands on my neck or the feeling as though something is resting its head on my neck or the feeling of something following me. For the past few weeks I've been having strange and vivid dreams and I've been waking up in the night hearing a crashing or knocking sound and feeling as though my room is shaking like in an earthquake, but as soon as I stand up its gone, I can fall asleep within seconds after but feel as though something is near but it's calming me down and feel like its telling me to sleep. I also hear scratching sounds in the night. I don't know what it is but my next few weeks are going to be really busy with work and exams at school and this is distracting me and people have started to notice somethings wrong and my grades are falling. To start with I thought I was just me imagining it but I'm not so sure now. My friend (who is a Christian) told me some advice to stop it but told me it only worked if I believed in Jesus and God, but I'm not a Christian as I've been introduced to Paganism and starting to follow it as my religion.