Thank you for the warm welcome, Michel, and for your kind words.
I've been thinking about an answer to your question about the form that my prayer takes, and it seems I can't find a satisfactory characterization.
I will say, though, that this extended Dark Night of mine seemed to bottom-out a couple years ago (not to say it's been all roses since then!), at which time I could not see the point of going on in life. In that place, I decided that if life made no sense to me, I'd try one last gasp effort before blowing the whistle on this game we call life. (This is how I felt at the time -- can't say I would really have gone through with it -- although I was having those thoughts way too frequently for comfort....)
I wrote a letter to God that day. It occurred to me to start it out with an expression of thanksgiving -- "Thank you for a good night's sleep and a pleasant, peaceful morning. Thanks for chirping birds and acrobatic squirrels outside my window. Thank you for the wonderful meditation I just had." Etc., etc. Then I just talked about whatever was there at the time, handing it over, washing my hands of it as best I could -- and where I couldn't get it off my hands, I asked for help, patience, surrender.... Then I would ask for Divine guidance as I read from scripture, ask for a good day with lots of help along the way, then I'd sign off.
That was two years ago and I've been starting (and ending, usually) each day this way ever since -- opening up LibreOffice Writer, dating it, hitting the keys. I do attribute my continued presence among the living to this practice, as it's been the only thing that's allowed me access to vibrations that are higher than anger, fear, resentment, self-hatred or whatever else I've been mired in. There's something about expressing thanks and appreciation that opens a person up, even when they are stuck in the darkest places -- and if it's done enough, one gets to layers that contain love.
If life is one long, humiliating assault on entrenched ego personality, I do recommend a practice like this. Jhana/samadhi may be blissful in its arising and saturation... but holy shit, it has no mercy when it comes to removing any and every blockage along the path Home.