Underactive thyroid gland symptoms and conditions

ive been on levothyroxine for about 6 years...... for an underactive thyroid gland and i am stunned reading all these side effects as for about 4 years ive suffered from severe joint paint, fatigue ,very low moods , foggy brain, mood swings hair loss, all i want to do is sleep and even then im still tired.
I am 35 and feel about 80 as my back hips legs calfs and feet all hurt so bad.
I have been to the doctors so many times and got no where.
ive been told your in pain because your depressed( who would not be depressed ) but i said i am depressed cause im in such pain.
i remember asking once if it was due to the thyroid or the drug and the doctor said your levels are fine and the drug gives no side effects.
I feel like stopping it right now to be honest.
I only got it after my third pregnancy and i remember reading once it can correct itself as it could be caused by pregnancy ????? any ideas.
ive copied and pasted a lot of these comments and i will be making a trip to doctors to be fobbed off again im sure ....but its worth a try