DISTURBING nightmares after starting meditation +subliminals??

The past week my day-to-day reality the past week has felt really strange and negative since I started doing intense manifestation practices. like unfavourable negative experiences and alot of unexpected bad news back to back.
l've been heavily meditating and visualizing right when ! wake up and before bed, listening to sleep affirmation tapes at night, using subliminals during the day, and constantly affirming in my head throughout the day.
Since starting this, I've also been having very vivid, graphic, scary disturbing nightmares, Has anyone experienced something similar after increasing these kinds of practices? have been manifesting stuff for years with no issue until this week???