Recurring dream: Staying at a hospital

I've had a couple of these. In the first , I was a patient at the hospital but I was lost and wandered the corridors and rooms looking for my bed. In this dream (from 28-10-08), I was yet again a patient but this time I wanted to use the toilet. I went to the toilet and stepped into the cubicle only for someone else to suddenly appear and obstruct me as I tried to lock the door. He was then joined by someone else and the two of them started to unscrew the locks from the cubicle doors, so I couldn't use it. I was very annoyed by this as I desperately wanted to go, but I had no choice but to leave and find another free toilet.

I spent most of the dream traversing the many hallways and rooms yet again (it was exactly the same hospital as the other dream and it was H-U-G-E), only this time looking for a toilet, but every time I found one there was some kind of problem. I became so frustrated by this that I was almost brought to tears and couldn't understand how people could be so inconsiderate to me as a patient.

I eventually made my way to the ground floor and wandered into an open plan office area where the workers were laughing and joking with one another. I asked a woman at a desk where the nearest toilet was because I was desperate and had been prevented from going and she got really defensive and thought I was personally blaming HER for my predicament, which upset me even more ("All I want to do is go to the toilet", I thought "Why is everyone being so difficult?"). She eventually pointed me in the direction of the toilet on the ground floor which was down a long corridor and I was FINALLY able to go as this toilet was free. I pushed open the door of the toilet and woke up shortly after that.

UPDATE: I actually think I know what this one is about. At the time I first had this dream until now, I've had a sleeping problem brought on by some medication I'm taking. As a result, I'm tired a lot of the time due to lack of sleep from the night before and need time to recharge my batteries but seldom get a chance to due to other engagements in my personal life. It has become a source of immense frustration for me as it seems like I'm not given a chance to rest, which makes me even more tired and irritable. I think the dream refers to this.