Getting tested is a really simple blood test. The Dr will request a TSH (thyroid stimulating hormone). If you indeed have hypothyroidism it will come back as very high and sometimes the Dr will then request a FT4 (free T4 or Thyroxine level) this will come back as very low if you have hypothyroidism. It basically means you aren't producing enough thyroxine so your body produces more of a particular hormone (TSH) to try and get the balance back in order. This doesn't work so your body just keeps producing more and more TSH and then you end up with a condition called hypothyroidism. It is relatively easily treatable but it all starts with a basic blood test. You can have the test done via your Dr through any local lab (Sullivan and Nicolaides for eg. in Brissy) and will have the results back the next day.

Good luck, just keep in mind there could be many other reasons for your particular group of symptoms so it's better to wait and see what the blood test shows.