I had a prostate orgasm and ever since i've had anal spasms when i have erections and powerful orgasms to the point sex is unbearable and i'm depressing. also my prostate is oversensitive when sitting and doing exercise. did i rewire my brain?

No, you didn't rewire your brain but you can get help from a urologist. You are now very focused on that area of your body that any sensations there can trigger concern for you. You can start w/your primary care doc and he can refer you to a urologist if needed. Please don't be shy. They've seen it all and don't judge. Peace and good health.

No. See a Urologist.