Connie Boss Alexander expressed her gratitude on social media, saying ... "Family and friends, thank you for all the love, prayers and encouragement. Please know I see all the messages, texts, posts and the phone calls."

In the Instagram story, it's clear tWitch's death has been difficult on his mother, she says ... "I can't use words right now. Please know I will reach out when I can. Please continue to keep us in prayer."

Later on, tWitch's mom ends with a heartfelt note to her late son ... "Stephen Laurel, your mother loves you to eternity and beyond."

TMZ broke the story ... the popular DJ and TV host was found dead Tuesday inside an Encino motel, the result of a self-inflicted gunshot wound. He left a suicide note, alluding to challenges he's faced in the past.