Doxycycl symptoms and conditions

I have been having many of the same symptoms while taking Doxycycline for Rosacea. Sweating excessively during the day and night sweats. Aching stomach whether taken on empty stomach or with food. Tightness in chest and feeling of anxiety and very emotional. I think it's the Doxy, I have been tested for hyperthyroid, because the symptoms are similar. This med. makes me feel like I'm going crazy. Has anyone stopped and how long does it take for all symptoms to go away. Has anyone switched to Tetracycline and had no side effects.

I've gained 10lbs while taking doxycycl and work out 5 times a week! Has anyone else had this problem

I also experienced loss of appetite while taking levaqin by the fourth day. I was given the prescription after apparently having a relapse of a sinus infection. I now have chest pains, difficulty breathing, fatigue, and I now ralize, the pain in my right hand the first night after taking this medication, could also be attributed to this drug. I contacted my doctor today to let him know of my side effects. Since I also have fibromyalgia, I was under the impression all of my symptoms were due to it except the loss of appetite. My doctor changed my medication to doxycycl. I am about to check the net on it, too. The pharmacy gave me a printout and it lists the same side effects. By the way, I also got the "weird" feeling and my stopped up for no reason, and I felt like my heart would race at times.CathyN