While multiple polygraph sessions are common in pre-employment polygraph screening at agencies using the relevant/relevant technique (NSA and CIA), they are less common with periodic polygraph screening of employees already hired.

It's possible that your multiple polygraph sessions are the result of the random error associated with an invalid test, but it's also entirely possible that you are suspected of violating the Espionage Act or some other infraction.

Yes, they are trying to get a confession now (to whatever questions you're being accused of deception on). I think it would be prudent to consult with a lawyer.

I am current govt employee undergoing my 5-year reinvestigation poly. 

I didnt use any countermeasures during my first poly. The poly examiner said that there was a problem with the first chart. So, the examiner had me do something unusual (which I later learned was a counter-countermeasure!) The examiner never accused me of using countermeasures. The examiner said that I had problems on one question, but I didn’t confess to anything serious. Examiner said that I needed to come back for another test.

On second test, examiner didnt use counter-countermeasures on me. Examiner said that I was having problems on several questions. Examiner interrogated me for a couple hours, but I didnt confess to serious anything. Examiner said that that I was hiding something. Examiner said that I would have to come back for a third test.

So, since the first examiner used counter-countermeasures on me (even though I wasnt using any countermeasures), are they just trying to get a confession now? Should I hire a lawyer? Shit, I feel so worried right now. Damnit.

What should I do now?