Health study symptoms and conditions

I was diagnosed with a sluggish thyroid also and the dr put me on 50 mcg of levoxyl. I had all of these symptoms of low thyroid hormones and didn't know it. I never put all the problems to the same culprit. I had very bad muscle aches, with or without exercise. I kept thinking I had bruised or torn something. I had weight gain on WW and a health study I was on. Nothing, I mean nothing would help me lose weight. I've gained 20 pounds. Which also caused depression. Sometimes I would have low blood sugar, when I've never had problems with blood sugar before. I was very tired all the time. I felt like I couldn't make it in the evenings and some mornings. I would complain to my PCP that I felt like I had just caught a cold - really drained and tired. I have really severe allergies and couldn't figure out why. After starting the meds I felt bad the first day - diarhea, nausea. Then for the first couple of days I felt great. Then the fourth day I couldn't sleep and felt shaky and had nausea only at night. After about three nights of no sleep, I cut the pill in half and took it. Then I was able to rest at night and didn't feel shaky on the inside. I took 25 mcg for about two weeks and then I started feeling the same way again. So I called the office and the dr said to take 3/4 of a pill. That worked fine for the frst week, but then I started getting these headaches that won't quit. I used the process of elimination and the thyroid meds were the only thing that changed. I will have to call tomorrow and see what I can do about that. If anyone has some of these problems let me know. The dr said that it doesn't have any side effects, but I beg to differ. I'm not sure what dosage to take today. I've had these bad headaches with a little dizziness for a week now.