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I only have it every five years or so but not following drink. I had it this week and I have been very low, in pain, and unrested due to nasal surgery last week. I think this may be a factor. Also been on very strong painkillers too - so don't know if that was a factor. Each time I have it though, I feel as though there is some ghostly, terrifying presence in the room either pulling my bedclothes off me, or pulling them downwards as though to try to crush my chest. Its very scary but I'm used to it now.