So when I just randomly click on Multiplayer; all my servers are gone! I had this issue before, and there was this issue about servers.dat and how it changed to tmp or something like that and you had to delete it. I do not have that. It has happened yesterday and today. Please help!
This does not occur with 1.9. I use 1.8.9 but it does not let me put 1.8 for the affected versions.
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This is not resolved as my servers.dat does not have servers.dat_tmp so I don't know what to do...

It's resolved as duplicate of MC-39583, which isn't resolved yet.
As for no servers.dat_tmp, you most likely closed your minecraft already, so you just have to insert every server in manually again.

I don't refresh it rapidly though. I just logged on and it wasn't there! I checked my .minecraft folder and there is no servers.dat_tmp. There is just server.dat and servers.dat

I didn't close my minecraft; it has been open all along

Then the issue occured a previous time, in which you didn't check your servers.
Anyhoo, go to MC-39583 and follow that issue.

So... how do I prevent it? I don't to constantly add all the servers back in ( I have a lot)

Make a backup of your servers.dat when you added them all back.
Again, move this discussion to MC-39583.
duplicate of MC-39583, if you have not, please use the search function in the future