BDSM is definitely not a mental illness.

It can be so good.

Since I was a teen I have had a sexual fetish for cross dressing that has caused both joy and sadness in my life. My current Wife did not know when we met that I crossdressed. She found out. Luckily for me She is understanding and proved to be creative in finding a way for us to do this together. Whatever your kink is the opportunity to experience it is valuable. For me it is two sided. Letting go and allowing someone else to "write the screenplay" is cathartic for me.
Having my partner "under my control" yet seeing the trust in her eyes makes me feel powerful, but also brings waves of love for her, all over me. Her submission is a gift not a given.

This is some of the problems with BDSM and bi polar.

It can be damaging to you and others if you engage in BDSM while in a hypomanic or manic state.

Never play with someone you don't know. Be wary of so called "Doms or, in your case I think Dommes? " who are looking to exploit people for money, and selfish sexual gratification. Im sure these so called true practitioners would say that a submissive should give themselves with no thought of their own needs or desires. I personally think Submissive or Dominant; it is essential to the experience if both parties benefit from the interaction.

When manic I personally will go from a Man/Husband with a fetish and a love for kink to this sexually depraved being who thinks looking for anonymous sex is an acceptable pastime. The effects and fallout from this kind of behavior can be devastating. This is an example of how BDSM can turn to self destructive behavior.

Good Luck, Don't rush into anything, learn from the community, Dominant or Submissive you still have control of your body and mind.