Pound body symptoms and conditions

I've been on levothyroxine 150mcg for about 3 months before that it was 100mcg and so on. I have gain lots of weight and tired all the time. depression also, headaches. I hate this gaining weight, sleepy all the time and depression is from gaining weight. I thought this med is to up boost my thryiode but it doesn't seem to be working. my dr. said I'm on the highest dose there is. I don't know what to do any more. I was thinking about taking myself off this but not sure what will happen if i do. I hope there is someone out there that might be able to let me know if they are going through the same things what they are doing and how they feel now.

Huge pupils
Hallucinating
Mouth moving constantly
27 pound body weight

My 21 year old son was a healthy,very handsome 5'10"tall and 220 pound body builder. He was a hilarious man with a great heart and the love of my life. He became addicted to xanax 4-6 bars a day. When he tryed to get off, my big precious son was sobbing like a baby, so afraid he coulnt beat this drug. Well xanax slam dunked him into the ground and killed him. I wish I had known more about the struggle he was having with xanax. It can get you in a strangle hold you cant get out of! BEWARE!