I would sincerely urge you to continue to experiment, as much as you are willing to, with at least few different combinations before completely writing off marijuana as a potential medical aid.

Specifically, I would try a different method of delivery and different potencies. If you aren't inclined to smoking or vaping, perhaps an under-the-tongue spray.

Depending on the concentration you have tried, I would try lowering the concentration of CBD and perhaps choosing something with a very small (1 - 5%) concentration of THC.

Obviously if you are not comfortable with experimenting for fear of another episode like you described, then don't experiment. A very large part of any drug is being in a mental state where you are comfortable using it. I don't have concrete numbers, but I would posit that the majority of bad trips are due to mental state of the user (comfort level, environment, preconceptions, etc.), not the drugs themselves.