I'm unable to continue in "The Great Work"

[TorynKYS]

In chapter 3: clock, there is a room were you have to to pull two levers while one of them is still cranking or whatever to open the door, before this you take a lot of damage from a fall, and without full health, you limp very slowly making you unable to complete the task to proceed. I don't have any Laudanum's, and their are not any in the library or the end of Samuel's Mansion, so is there something I can do to proceed, or am I going to restart and conserve Laudanum's? Please help me, thanks, Toryn.