Can Amitriptyline cause nightmares? I usually have fairly harmless but vv weird lucid dreams.?

I'm on 50mg at the moment, I've gone up from 10mg over about 3 weeks. Firstly, I was just having scary little dreams when I was dropping off to sleep, like for example my hand about to go into some sharp-looking machinery but without anything before that or anything after, I'd wake back up before it actually went in. Then, I was still getting that but having really weird dreams where all of a sudden something potentially awful was about to happen like falling over a really high bannister or maybe i'd be shopping somewhere and I'd go into a new shop and it would be all full of broken body parts still with clothes on. Then last night, I was stuck in a bog that smelt really bad and all around it was fairly stereotypical horror stuff, like spanish moss hanging from the trees and low fog and leeches and stuff but it was actually scary and I couldn't get out of the bog, or I could but didn't want to because I thought I couldn't, and there was all these dogs staring at me, that had Gollum-heads. I woke up at 1.45am so I'd been asleep about an hour and 45 mins and my heart was pounding and I felt like I had a migraine because my head was throbbing and I was really terrified. I actually don't want to go to bed tonight it was so horrible. Is this the amitriptyline? Can I take it at a different time (other than just before bed, I usually take it about an hour before I go) to stop this happening? I usually have lucid dreams that always happen in the same town and I know my way round it and can control what I do- I can't control what I'm doing in these dreams at all, they just happen, it's not even like I feel I could control them but am choosing not to or aren't able to, there's just no feeling of that, like you get with lucid dreaming, at all.