i think i have a thyroid condition please help?

these are all my symptons that match with the symptons of a thyroid condition:

bad headaches (i get these everyday and take 4 parcetomols everyday from awful headaches)
gain weight and extremley difficult to lose weight (so many diets i have tryed, this is so hard)
memory loss/forgetfulness
mood swings (i am a teenager)
exhaustion (all the time i had shingles last month because of tirednes i am tired all the time)
aches everywhere
fatigue
depressed sometimes (feel low all the time and then suddenly change mood)
fuzzy thinking
sometimes constipation

i looked on websites and these were all symptons of Hypothyroidism Symptoms

what should i do?
do you think that these symptons is it?

lily xx