Controlling HI is more subtle than controlling a full blown dream. Probably because you have less content in HI than you do in a full dream, so you have less choice as to what to focus your attention on. Try reframing what you see and thinking about it in a different context. If what you're experiencing is unpleasant, try to single out one element that you can spin into something more positive. It's really hard for me to explain.

Another option would be to speed up the HI process to jump right into the dream. Hi ends and dreaming begins the moment you acquire your dream body. Just hook your attention onto anything that it moving, and try "feel" that sense of movement. This should speed up the appearance of your dream body. It might just start with the sensation of arms and/or legs, but then you're half way there. Of course this will likely land you in a dream based of your HI, but you can always fly the hell out of there.

Or you could always try to incubate something different.

There are lots of options to consider before drugs.