@dyani i've never actually tried using antihistamines. my main problem isn't getting to sleep, it's staying asleep through the night without waking up every couple hours. if i don't get the really deep sleep happening, i remain drowsy throughout the daytime.
weighted blanket didn't do that much for me. i'm not great about the basic stuff like no screens before bed or cutting down on caffeine. i do try to avoid caffeine after 2 or 3pm, but that's about the extent of it.