Stilling/quieting your physical mind activity absolutely could have the effect of causing suppressed and even subconscious mental and emotional material to surface and rise to the forefront of your conscious state (which is how it needs to be processed and released)... If this were to happen it can be confusing for the experiener - because all of these feelings and emotions are suddenly being experienced which do not have a logical 'source' is your present and everyday life circumstances...

I would also be mindful about fueling fear-based thought patterns (like being inclined to attribute challenging/uncomfortable experiences to 'demons')...

If your instincts tell you not to continue with the practices you were doing just recently - consider taking long walks outside, preferably in a more natural setting/environment... The exercise and repetitive bilaterial walking motion is supposed to be great for healthy mental/emotional processing - and being out in nature is very grounding and facilitates a temporary disidentification with the repetitive activity of the physical mind...