I think mania magic exists to the same extent regular magic does. Some otherwise normal (whatever normal means) people believe magic is real but many don't. Some people would say that every person that believes in magic is on some level delusional. Others use it as part of their religion.
So from a spiritual perspective, there may be something to it, there may not, but it's most likely an imagined/delusional connection due to the specific timing of events filtered through your manic state. You should definitely let your doctors know. Most doctors fall into the "magic just isn't real at all" camp and dont personally follow faiths that use it, but it's important for your health that you recognize that just because it's a part of some religions doesn't mean your personal experiences aren't delusions from the intense stress mania can put on your body and mind. That's why we have doctors, people trained for this. And even if magic is just real in general, being manic is not a healthy state and if you have to be manic to access it, you may just have to give it up anyway.
There are some sacrifices in perception that we make because our life and our health demand it of us. It's not fair, but the alternative is misery and sometimes death, so whether magic is real or not might ultimately be an irrelevant question for you and your health. Talk to you doctors, be honest and specific. Don't leave anything out. Listen to them, follow their guidance, and see where it takes you and if these experiences of "mania magic" disappear as your mental health improves, be willing to let go of them. Be willing to accept they were never real.