If it's clicking, it's (basically) already gone. Buy a new drive today, and copy that stuff off straightaway. Do not power it off until you do this (it may not come back on). If you care about that data at all, and it's not backed up elsewhere, consider this an emergency measure (so if it costs a few extra bucks than it otherwise would, it's that or your photos).
In the future, back your stuff up (many options). Two is one and one is none when it comes to data you care about in the slightest bit.
Hard drives are cheap as hell these days anyway. I bought a 5TB drive a few weeks back for $135, and I remember paying that for 500GB in 2007 and thinking I was king of the world.