Hope you have recovered from your fever.
Is there a specific reason you need a TIN number?
Its a fairly straightforward and simple procedure that should take longer than 30mins. You just need to go to the local BIR office with birth certificate and in your case probably passport. Remember to photo copy first

They will give you a form to fill out. Once it is completed hand it back at the appropriate window and they will issue your number.
If you want to fill it out before i think this is the form, however you never know when they might decide to change it. Part of the fun of living in the Philippines
ftp://ftp.bir.gov.ph/webadmin1/pdf/21301904.pdf
Hope that helps.