Not sure if I'm alone in this but it has been bothering me for a long time. I normally use a standard 2.1 stereo speaker system for listening to music, and open-back headphones for listening on the go. I want to switch to in-ear monitors for casual listening, but I find that as soon as I put them in and can't hear anything in my environment I immediately get super paranoid. I try my best to just immerse myself in the music, but no matter what I constantly have the urge to check my window, or my door, or just my general surroundings. My eyes usually go into overdrive due to the loss of a sense and I end up just looking all over the place constantly, it is a really unsettling feeling. This applies to all sources of hearing loss by the way, not just IEMs. Same thing happens if I listen to quiet comfort over-ear headphones, or just have safety earplugs in. 
 
Does anyone have any experience or advice for something like this? Right now my only realistic option for earphones is to go with apple because IEMs completely dominated the portable listening market, and apple earphones suck. 

You are not alone. Same thing happens to me.