So a few years ago I lit a Buddha 7 day candle for success, luck. I had it lit for a few days. After that I started to notice small paranormal occurrences. I felt like I opened a portal. I’m not too comfortable with being a medium yet. Also, I noticed I can’t have certain crystals in my room while I sleep.
Recently I started working with candles again and I’ve experienced the same thing.
I am also very sensitive when I come into contact with crystals. When walking into shops with a lot of crystals I would sweat. Quartz would give me terrible headaches. I even had a stone that showed up in my house again after I got rid of it (because I wasn't reacting well to it energetically). My relationship with crystals began to heal after I began working with an oracle deck called "crystal spirits" by Colette Baron-Reid. It helped me gain more of an understanding of working with the crystal instead of against it. I would also recommend clearing the energy of the crystals you are currently working with and infusing it with your own if you haven't! I also found that sleeping with a crystal under my pillow helped heal my relationship with them as well. Carrying a gentle crystal such as rose quartz around in your pocket or purse helps too.
I am a medium as well (though I have not done any medium work yet). I found that calling in my guides and angels to shield a layer or protection over me while I sleep has helped limit the paranormal occurrences.
I hope something in this message resonates with you and I am wishing you good luck on your journey!