how did his operation go? hope everything went well, tell him im thinking of him. im sorry for the message i sent i was just worried and thought he wasnt talkin to me.

If this is urgent, I think this will be understood. But if you want something really normal sounding you better wait for a native speaker, (that will probably reply shortly because they seem to enjor correcting my stuff!) Here is my attempt.
I added an extra line to your english, for clarity.

English:
"how did his operation go? hope everything went well, tell him im thinking of him. im sorry for the message i sent i was just worried and thought he wasnt talkin to me.
(later I learned he was sick)"


(Turkish)
"Nasil onun operatörlüğü oldu. Hersey iyi umarim. Onu hakkinda düsünüyorum söyle lütfen. mesajimden evvelki gönderdüm hakkinda, onu kusura bakmasın. Beni aklinca onden bana istemedigi söylemek, merak ettim. Sonraki onu hastadir anladim. "

thank you for doing that, didnt get chance to say thank you untill now.