Sore throat

Since yesterday, my throat has been hurting. When I woke up today, I had a terrible sore throat. I am lucky because today is not a work day in Mexico. This is because of the anniversary of the Constitution on February 5th that is always moved to Monday. I will now have sufficient time to rest appropiately.

Sore throat

Since yesterday I have been uncomfortable with my throat (better to say, since yesterday, my throat has been hurting). But now, since when I woke up, I have got a terrible sore throat. I am have lucky because today is a not working day in Mexico because of the anniversary of the Constitution that is on in February 5th but always is always moved to Monday. I will have sufficient time to rest appropiately.

Well written, only a few small changes :) I understand what you have written perfectly, the changes just make it sound more natural. We always use "on" with dates or days, e.g. on February 5th or on Monday. And for dates we use first, second, third (1st, 2nd, 3rd) etc.