but like others have said there are differing interpretations of Jhana, and what you were describing (as I was seeing) seamed more like wet Jhana, and dry insight, there is one and the other, and they don't mix fully at least.
My current practice is "dry" vipassana, and currently experiencing constant agitation in mind which would not go away (though trying to "let go" of the desire to get rid of this). So I want to explore the "wet" method too to see if that will help me become more relaxed and tranquil (using suttas as guide).
I think the problem with a separation of the two, for some people, is what you describe here, agitation, the dry insight lacks the lubrication of samadhi, so for some people there is an abrasive element to the practice on some level, everything is too course and dusty, things are held to tightly so we can not see it properly, like using a gauntlet to pick up a piece of fine delicate parchment, or turn the pages of a 1000yo manuscript, and the same is true with jhana only, everything is too refined so it can be like trying to keep hold of soap in a bath, you can see it but it is not possible to move it to get a full picture of it. These are forms of Upādāna, grasping, in a wrong way, one can lead to roga the other to dosa, affection & disliking, even if only on a subtle level.
Try dedicating the first portion of each sitting to finding a happy place, a gladdening of the citta, the mind would then be more likely to withdraw from any agitating factors, and be more careful in how it holds objects. like stinging nettles, if just grabbed cause agitation, but if taken hold of correctly can be picked without any sting.