Where can I find good very spicy Mexican or tex mex?

I go to Tex-mex and Mexican places around Houston and aside from the hot green sauce found at some taco trucks, I can’t seem to find that high spice level like you can get with certain Thai, szechuan, and Indian.

I know it exists. The first time I ever had habaneros was at a little hole in the wall Yucatán place, but that was actually in the Yucatán so it doesn’t help me here.

Help me sweat and burn from spicy goodness.