TTC and no luck

Katie
Hi guys. Just curious about how much levithyroxine you take (if you take it) ? 
I was diagnosed just over 2 years ago and started out on 25mcg. Since then everytime I go to see the doc he ups my dosage and now I am currently  taking 150mcg daily. I still have the same symptoms I started with (weight gain, fatigue, cold extremities, etc). I have since had 2 miscarriages, both before 12 weeks with no explanation from my doctor and no interest from him to test further. 
Has anyone experienced anything similar?