Steering problems

[drmmr15]

So I searched around, but did not find anything to really help diagnose my problem. I have an 87 Turbo 5 Speed. I just fixed the car, and have been driving it around. It runs great except for my steering. I know it has a leak, so I have been making sure to keep it full of fluid. But the whining noise has become worse, until finally, I am afraid to drive it because I think Ill ruin something because it sounds so terrible. It is becoming increasingly difficult to turn, esecially when parking. I am going to park the Supra until I resolve this problem. I dont know much about power steering, or about the steering rack, but I was wondering if this sounds like a power steering pump problem, or if I need to replace the whole rack and pinion assembly? Also, is there a specific brand or type of power steering fluid I should be using, or does STP general power steering fluid work fine? Thank you for you advice.