Overtraining Syndrome (Overactive CNS)

I am a fully fit individual, started doing gym in the month of January 2025, but I used to have dinner before going to gym, sleeping empty stomach at night after high intensity gym usually only drinking milk. In February also everything was fine for first 20 days then started to have sleep issues while being able to hear my heartbeat, stopped doing gym at night and problem resolved within days. Then due to some reason i convinced myself that this was only happening due to late night cardio and continued to do work out (only weight training) at night(10 PM) , and eating before the gym , and for some days I was able to sleep even though I was hearing my heartbeat when I sleep (on my stomach). Continued to do gym and slowly things got worse in April and I stopped going to gym in the end of April doing only swimming, but after sometime swimming also lead to the same issues and I was unable to sleep . I have left both activites since then, but my CNS is still active.(sleep issues are still)