There are a couple options here:
You can follow the link in my signature and look in the HINTS section which list 3 locations where one player found glowstones (sometimes it can be slightly random).
You can try blocking the door of the first room you have opened with a crate or chest, taking the glowstone back and use it to open the second room. The trigger to open the secret alcoves seems to not only be the two switches but keeping the doors open.
If you still can't make a go of it and you're super stuck. Email me!
Wyv
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