The waiting room

Here I am, seating in a waiting room. So, I've just decided to write an entry. Thus, I in hopes that the time passes quicklier. Today, My annual medical examination was scheduled for today. The appointment was set a 11:50, and  after one hour I'm still waiting for the blood extraction. I came by car to the medical centre, which is located in Madrid's downtown, so I have had to pay for parking my car in this residential zone. But there's an issue,; my ticket is only valid until 12:30. So Therefore, I only have only 30 minutes available left until I get fined by a parking controller. Bearing in mind (technically it's correct, but doesnt sound natural) all the appointments have been delayed because the building's electrical system went off this morning, Therefore I'm pretty sure that I'll have to go to my car and put some extra money in the parking machine ("parketing meter" is what we say in the USA).

That's not the worst part of the delay,. I'm feeling dizzy because I haven't eaten anything since yesterday's last night. You know, when you're going to get your blood extracted, you aren't allowed to eat something which could influence in your blood analysis results. I hope to finishing this waiting torture soon :)

Nice work! Hope you didnt have to wait too long! :) 

The waiting room

Here I am, seating sitting in a waiting room. So, I've just decided to write an entry. Thus, I hope the time passes quicklier quicker. Today, my annual medical examination was scheduled. The appointment was set a for 11:50, yet after one hour I'm still waiting for the blood extraction draw. I came by car to the medical centre, which is located in Madrid's downtown, so I have had to pay for parking (or to park) my car in this residential zone. But there's an issue, my ticket is only valid until 12:30. So, I have only 30 minutes available until I get fined by a parking controller. Bearing in mind all the appointments have been delayed because the building's electrical system went off this morning, I'm pretty sure that I'll have to go to my car and put some extra money in the parking machine (or parking meter).

That's not the worst part of the delay, I'm feeling dizzy because I haven't eaten anything since yesterday's last night (or since yesterday evening). You know, when you're going to get your blood extracted sample taken, you aren't allowed to eat something anything which could influence in your blood analysis results. I hope finishing to finish this waiting torture soon :)

Excellent Juan! My corrections are in red and my suggestions to sound more natural are in blue/grey. 

"The appointment was set at 11:50" means that 11:50 was the time when you called the doctor's office to make the appointment.

"The appointment was set for 11:50" means that 11:50 is the scheduled time of your appointment.

A blood extraction is known as a blood draw in the USA, so you would say "waiting for the blood to be drawn".

In the UK it's called a blood sample, so you would say "waiting for the blood sample to be taken".