Legality of recording all sexual activity?

This probably depends on whether you are informing the other party or parties that they are being video recorded. Are you planning to tell them?

What's the most that can happen to me for a probation violation on a domestic felony case of a special conditions of not seeing

You can be sentenced up to whatever was stated and new charges could be filed for the violation. You should hire an attorney to fight this.

There may be a medical reason for your behavior but you haven’t indicated why there was an illegal arrest. You should hire counsel if you’ve been...

Will watching adult porn with only my adults making out is that illegal?

Adult pornography is not illegal. However if there are children featured it is extremely illegal.

What can I do?

This is a scam. Don’t send any money and cut off contact. Also learn a lesson about interacting with strangers on the internet.

Were my 4th amendment rights violated

There might be a violation. Get a lawyer to challenge the search and seizure.

Why do drug addicts get away with so much?

You can get him into treatment. This isn’t a legal issue.

How far can a law enforcement agency use a civilian as a confidential informant in exchange for legal lenience?

Law enforcement uses civilians as informants all the time. You need a lawyer because you are clearly not familiar with the criminal justice system.

Will my probation officer find out about a petty misdemeanor I just got?

You’re probably required to report contact with law enforcement. Get a lawyer to fight this.

What does "order to release from custody mean"?

It means he will be released from jail. Get an attorney as you are In over your head.