May I recommend that you read Divine Mercy In My Soul: The Diary of St. Faustina? You sound like me; I continually question what I said and did in confession. Did I mess up? Did I say it right? I flubbed one of the prayers during my penance, am I still forgiven? Trust in God’s mercy. He did not give us His Son to die on a cross for us just so He could say: “Ooh, sorry, you didn’t say the words of that prayer exactly as it is written. No absolution for you!”
Try to relax and TRUST fully in God’s mercy.
He will not abandon you…He loves you! And He WANTS to give you His mercy.
The exact wording of the prayer isn’t the important part. (See Matthew 6:7 if you need further proof of that!)

All you really have to do is say “Sorry” if you don’t know the words of the prayer. The important thing is that you were contrite and I’d venture to guess that, if you were crying in the confessional, you were sorry. When you are absolved of your sins, you are absolved of EVERY sin - including any you may have forgotten to confess.
Now, if it was a mortal sin (or may have been), then yes, confess it.
But otherwise, you may want to tell your priest during your next confession that you are struggling to let go of the guilt of past sins and see if he can assist you with that or give you a little spiritual direction. I got some great advice on something like this last time I brought it into confession.
God bless!