Recovering 1TB of unallocated space?

Please read the post well. I posted somewhere and most of the posters assumed that the 1TB table is there. It's not. Also, the size of the MDF is 1.75TB, the HDD has 1.83TB used and 65.8GB is free.

So here: my problem: I needed to reduce my 1.8TB MDF, so I dropped a table that took up 1TB of space.

Now, according to sp_spaceused, I have 1TB of unallocated space and I want to recover it.

What I did:
1) I began executing dbcc shrinkfile yesterday, but "percent_completed" 24 hours ago was 39.75% and now it's 40.80%. At this rate it'll take over two months.

2) I ran shrinkdatabase with TRUNCATEONLY option (following code), and it went from 1.76TB to 1.74TB.

3) I cannot reindex anything because the table with the data is gone.

What other options do I have to recover the unallocated space?

Thanks.