Should i take medication? Hypothyroid?

In 2014 I weighed 120kgs, I got my blood tested to find out that my TSH was 12 and T4 was 4.8 (below the normal limit) while T3 was normal. Between 2014-17 I got my blood tested 4-5 times where T4 was low and TSH was high. I reduced my weight and followed a proper diet but did not start any medication, Now in 2018 I weigh 84kgs, I follow a proper diet my T4 and T3 are under the prescribed limit but my TSH is still at 10.80 while the limit is 5.50. My problem is that I have extreme emotional shifts, sometimes I'm perfectly normal but after a couple of minutes I'll be very cranky and irritating.                       I have a few questions: Is this normal? Is my hypothyroid under control? Do hypothyroidism patients need compulsory medication? Can i control my hypothyroid without medication (like diabetes/BP) ?? Nobody in my family (including my maternal and paternal forefathers) had hypothyroid, I did not have any thyroid surgery ... Then why did it happen to me? Is it even hypothyroid?