Synthroid and severe anxiety

I was prescribed Synthroid for Hypothyroidism about 6-months ago. I was told my thyroid is covered w/ nodules caused by Hoshimotos(?) Thyroiditis. Prior to that I suffered with severe anxiety attacks. Since my first dose of Synthroid I have felt much calmer. I realize Synthroid isn't prescribed for that, but I definitely feel much better. However, now it is early spring, and I ventured out for some light gardening and thought I was going to die from heat stroke and a pounding heart - it is only 68 degrees! Could this be a side effect or perimenopause?

I have been on synthroid for 30+ years. It has steadily been increased throughout the years. Last April 2007 I ran out of medication and was going through a stressful move. I hadn't been on the medication for about 6 weeks. Once I got my new doctor they checked my levels and instead of putting me on the same dosage of .175 they increased it to .2mcg. I gained 10 pounds overnight. I looked like I was pregnant, mood swings, aching joints, insomnia, etc. I went back in 2 weeks to have it rechecked. That was the second problem. It takes 6 weeks for the medicine to level out in your system. So not only did they increase my dosage after telling them I had been off of it for some time they retested my levels too soon. So it was again increased to .225...more weight gain...another test...another increase .25mcg. Now my neck is swollen and I have an enlarged gland, hard to swallow, shortness of breathe, 43 pounds of weight gain, severe anxiety, acid reflux, gerd, on top of the other symptoms mentioned above. In 8 weeks of increments I have been retested and the dosage has gone down and as of last week it was finally decreased to the original amount of .175mcg. It has only been a week but I have lost 2 pounds. Oh Lord please let it keep coming off! My neck isn't as swollen and my 5th doctor who finally could see the light explained that I was having a thyroid storm. It is very important that when your levels are checked you wait 6-8 weeks to let the medication level out in order to get a true reading. He also said that you need to take your meds on an empty stomach...which I knew...sort of. I took my synthroid on an empty stomach but I also took my other vitamins with it which can effect the absorption of the synthroid throughout your body. He also gave me a beta blocker to help with my symptoms until my levels even out. It is called metoprolol succinate (Toprol-XL) 50mg. My gut doctor put me on Paxil as well to help with the acid reflux and gerd which he felt was caused by the anxiety due from the synthroid levels being off. I hope this info helps but it makes sense to me.

I started taking .088 of synthroid for an underactive thyroid. My levels were actually not that low. After about a week, I had a severe anxiety attack and have felt anxious for about a week now. I completely stopped it and have no intention of starting it again unless it is on a much much lower dose. My MD said that this was a low dose but now I hear there are much
lower doses.

What is the usual starting dose and has anyone else experienced the
anxiety effects?