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Noah Weiland is doing alright after making some nerve-wracking posts on Instagram Thursday ... with a family friend coming to his aid during what seems like a time of crisis.

Tim Ryan -- a friend of the Weiland clan -- tells TMZ ... he spent all Thursday afternoon and evening with Noah after he posted about his own death on IG, and the 25-year-old is doing fine.

We're told the son of Scott Weiland has spoken to his mother, Janina Castaneda , since sharing the posts, and she's aware he's safe.

ICYMI ... Noah shared a blurry gray photo with white words written on top, which began with "I'd rather be DEAD then live as my father did." He then followed it up by writing that he can't wait to see his dad again and thanking everyone for their support.

He also set a

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