And all Israel from Dan to Beersheba recognized that Samuel was attested as a prophet of the Lord. The Lord continued to appear at Shiloh, and there he revealed himself to Samuel through his word. Then Samuel took a stone and set it up between Mizpah and Shen. You, of course, need to be prepared to share. I would read up on this again, just to refresh your memory.
Impressions are impressions.
Don't ignore them, but don't put them on par with scripture. In a way, in this case, He did. Not so much what Eli should do, but what would be done to him. Normally, God speaks to the person who needs the word directly. I am very suspicious of the person who says they have a word from God for me.