Power steering

I initially had a small power steering fluid leak. It was not a huge deal at the time. I would just check it and fill accordingly with plans to get the hose checked and fixed. Over time, the car began to hum loudly upon pressing the gas pedal, but would subside when the rpm's would go down. Upon turning, the hum would return loudly. The power steering fluid is becoming foamy, and now the steering wheel is stiff upon starting the vehicle. After turning the wheel a few times, it steers okay, but the hum is still there. I had believed the hum was coming from air in the pump. I took my vehicle to an auto shop, which told me upon inspection that I need all new hoses, a new power steering pump, a new rack and pinion quoted at over $1,800.00. They then told me that in order to get to the rack and pinion, they need to take something out, but the bolts to it are rusted, and if they break, it could drop the cradle and total the car. (?) Any advice on what I should do or if this process sounds accurate or not? Any and all is greatly appreciated.