hypothyroid levoxyl weight loss success

i am 17 years old, when i was young my parents said i went from really active, to tired, and weak.. i started to gain weight out of no where.. i would go out in 2 thousand acres of land, and spend all day out roaming the land with my brother, cutting trees down,catching animal, jumping from bails of hay, all kinds of active things! but my weight was slowly rising, i only ate at breakfast, lunch at school, and dinner! i drank water from the tap and water hose. i was out all day,everyday and i wasnt losing any weight, i was slowly rising(maybe because i was so active at the time, and wasnt taking much in, it didnt show.) but my mothers friend, went from 400lbs to 120lbs when she was put on her thyroid medicine, she noticed how i would lose my breath easy and my weight gain, she told my mother to have my thyroid checked, and that she went from 400lbs to 120lbs and she ate 3 doughnuts and eggs every morning! (seriously though, thats alot for a small [like 4"10] woman to eat, just for breakfast, though she would walk miles every morning too.) 

So my mother took to get me checked, but the doctors refused, saying that it wasnt my thyroid, i wasnt active enough and needed to eat less,and said that doing the tests would hurt me to much, to be worth a hunch.. well we moved states when i was 11, and i really let myself go, i gained roughly 40-60lbs in such a short time, and i was out riding bikes almost all day with my cousin, through town, jumping jumps, all kinds of things, but i was still gaining weight above 200lbs now.. then i got into gaming, in like 2007 maybe? a bit before Halo 3 came out, if any of you know it (mind you i didnt play alot before halo 3) and i went to 270-280lbs, when i went to the doctor 2 weeks before my birthday,(april 14th) and my doctor put me on diet medicine and told me to excersize 15 minutes a day, just walk for 15 minutes. so i continued to play games , and walked and jogged a bit (not faithfully, and at little.) so 2 weeks later i go back to the doctor, and BAM, in 2 weeks i gained 50lbs!!! you all are saying 80lbs in months, i gained 50 in weeks, and thats with cutting back a bit, and running more than normal! the doctor looked at me and my mother wide eyed, he didnt believe it either.. so he checked my thyroid and then put me on levothyroixn(or whatever the spelling is) he said the 50lbs was water weight, but the funny thing is when i went to the specialist, he said it wasnt serious, that hypothyroidism is common, and mine wasnt very serious.. (by the way, i have plateau'd at around 330-340) we went back again, and he checked my thyroid again, ran more tests (this happened a total of 3 times from the specialist) and he evidently found something, and raised my dose (im almost positive he found something, because when we came in my mother confronted him asking how mine could be serious, yet me gaining so much weight out of no where. after testing he raised my dose and made excuses without looking at me, or my mother.) and now apparently im fluxuating, i stay in the 300's but everyone says i lost alot of weight randomly, (taking my medicine, drinking water, and cutting back food) to be completely honest i dont know how, i have taken my medicine faithfully for max 1 month, and its said to take atleast 1 1/2 month for its to start to work.. so i cant really see that being the reason for me losing weight like people say i have (saying that they havent been lying to me, lol but my mother is extremely blunt, nothing hidden, nothing sugar coated.. which is a good way to raise a child in my opinion, it makes the realization of the hardships in life, easier to handle) but i know water weight is a huge problem that comes with hypothyroidism, how you can counter water weight, is stop your sodium intake, and drink alot more water,i would imagine most of you could drop 50lbs easy, and quickly if you just cut out salts, and drink only water.. no cokes, sweet tea, things like that.. i dont know if this will help everyone, i cant pin which helped me, if it was cutting back food, drinking less soft drinks and more water, or my medicine, but i know at one point not to long ago, i had trimmed a bit.. ohhh and i also worked out a bit, my step dad was a fitness freak at one point and so we have alot of weight equipment, so i would do his long 30 minutes to 1 hour sometimes longer.. i would do that every monday and friday (there is a wednesday, leg workout, but i dislocated my knee and i couldnt do the workout.) so that would probably help as well.

ALSO! is it hard for everyone to keep up with their medicine? i find it hard to take regularly,the conditions are strict, the eating part isnt really a problem, but timing it to the dot everyday, and not being able to mess up but by a few minutes, just makes it hard for me.