Sick application letter

[asad hussain]

Hello, Could someone please have a look at the sick application letter below for grammar mistakes, and weird sentences?
__________________________________________________ ____________________
Dear Madam,
The reason I was absent on Tuesday, February 13th, 2007, was I was seriously afflicted with gastric pain. I had been taken to a local hospital at 4’o clock in the previous night. The doctor had given me some injections, and had advised me to take some rest, as the energy level had been quite low.
Therefore, I feel I should be allowed to use sick time.
Meanwhile, thanking you and assuring you of my efforts as ever I put in.

With great regards,

Sincerely,
Sarah
__________________________________________________ ____________________

[Tdol]

was I was- was that I had serious gastric pain
the energy level- my energy levels

[BobK]

I agree with Tdol's two suggestions. Also this:

Meanwhile, thanking you and assuring you of my continuing efforts.

b