Find the number of solutions to
\[\frac{1}{\sin^2 \theta} - \frac{1}{\cos^2 \theta} - \frac{1}{\tan^2 \theta} - \frac{1}{\cot^2 \theta} - \frac{1}{\sec^2 \theta} - \frac{1}{\csc^2 \theta} = -3\]in the interval $0 \le \theta \le 2 \pi.$
We can write
\begin{align*}
&\frac{1}{\sin^2 \theta} - \frac{1}{\cos^2 \theta} - \frac{1}{\tan^2 \theta} - \frac{1}{\cot^2 \theta} - \frac{1}{\sec^2 \theta} - \frac{1}{\csc^2 \theta} \\
&= \frac{1}{\sin^2 \theta} - \frac{1}{\cos^2 \theta} - \frac{\cos^2 \theta}{\sin^2 \theta} - \tan^2 \theta - \cos^2 \theta - \sin^2 \theta \\
&= \frac{1 - \cos^2 \theta}{\sin^2 \theta} - \frac{1}{\cos^2 \theta} - \tan^2 \theta - 1 \\
&= \frac{\sin^2 \theta}{\sin^2 \theta} - \frac{1}{\cos^2 \theta} - \tan^2 \theta - 1 \\
&= -\frac{1}{\cos^2 \theta} - \tan^2 \theta = -3.
\end{align*}Hence,
\[\frac{1}{\cos^2 \theta} + \tan^2 \theta = 3.\]We can write this as
\[\frac{\sin^2 \theta + \cos^2 \theta}{\cos^2 \theta} + \tan^2 \theta = 3,\]so $\tan^2 \theta + 1 + \tan^2 \theta = 3,$ which simplifies to $\tan^2 \theta = 1.$  Note that up to this point, all our steps have been reversible.

Then $\tan \theta = \pm 1,$ so the solutions are $\frac{\pi}{4},$ $\frac{3 \pi}{4},$ $\frac{5 \pi}{4},$ and $\frac{7 \pi}{4},$ for a total of $\boxed{4}$ solutions.