6:49 PM PT — Tara Reid tells TMZ … “Bottom line is no one ends up in the hospital incapacitated for over 8 hours after a drink.”

She continues to tell us … “Last thing I remember is having one drink and waking up in the hospital the next day without remembering anything. That was the scariest feeling I have ever felt. I felt so helpless.”

Reid reveals … “This has been a horrifying experience for me that is severely affecting my mental health. I cannot sleep over this it’s a very scary feeling not knowing what happened to me.”

Tara ends with “I believe I was drugged. Something happened to me.”

Tara Reid‘s claim someone slipped a drug in her drink doesn’t hold water with cops, who’ve found no video to back up her allegation … TMZ has learned.

Rosemont police tell TMZ … they reviewed surveillance footage from the Chicago-area hotel, and there’s no indication — at least based on the videos they saw — anyone drugged Tara last month.

We broke the story … Tara was taken out of the Doubletree hotel on a stretcher, loaded into an ambulance and driven to a hospital. She says she left her drink unattended at the bar and believes she was drugged.

Sean P, the YouTube influencer Tara shared a cigarette with that night, also told us police investigators reached out to him Wednesday to ask about Tara’s claim she got drugged. He says he relayed the same info he told us — he didn’t roofie Tara, and didn’t believe her drink was spiked.

In her police report, Tara claims Sean P texted her videos of her the next day, which she believed was an extortion attempt … but Sean says he was only giving her a heads up his friend had video of her getting rolled out on the stretcher.

Sean P says cops told him he’s not being looked at as a suspect, and they just wanted to talk to him about what he saw with Tara that night.

Cops did tell us they’re still waiting to get any medical records from Tara’s hospital stay “to confirm if tests were done, and if they were, if anything was in her system.”

Tara told us she believes there were blood tests done, but she’s also waiting to get results.