So, after missing an obvious escape and taking way longer to complete Level 9, I'm stuck on Level 10: Refueling Base. I was doing okay for a little while, but then I died, and I keep dying, and the game keeps taking all of my shit away, which is making this way harder. 
 
I was curious if any Doom II vets had any tips? I've certainly played Doom and Doom II, but never finished either.

My speed run of the level was about a minute longer than this one, but that's because of the gatling gun guys and invisible pinkies at one point.  Plus, the shottys and clippers in that one room can be assholes from time to time. 
 
Nonetheless, level shouldn't take more than about a minute or two to get through.