Levoxyl and diet pills

I have been on Levoxyl for about 9 years and have felt awful. I have had weight loss, dry hair, thinning hair,dry skin, muscle aches, migraines and the list goes on. I just got out of the hospital Monday after 4 days of testing of my heart and lungs. I was admitted for racing heart. The doctor's conclusion was anxiety! They said that Levoxyl has nothing to do with my rapid heart rate. The endocrinologist prescribed taking levoxyl .050 on day and .075 the next also a beta blocker, Xanax and Zoloft. I can not take any of these meds b/c they make it almost worse. I KNOW it is not Anxiety and it from the Levoxyl but what do I do?? I am a mess right now can not be in this condition with four young kids and a husband. None of the doctors would say it was the Levoxyl and instead prescribed more and told me to check up with blood work in 6 weeks. I took the .050 yesterday around noon and by 7:30pm my heart rate picked up again and continued until 4:30 this morning. I can not sleep more then 2 hours at a time and wakeup feeling like I am crawling out of my skin. PLEASE let me know of any solutions.