Doxycycline Hyclate Back Ache, Calling 911, Heart Beat, Panic Attack, Shortness of Breath

Thanx for this site. I took Doxy for 3 days (100mg twice a day) and i woke up with a terrible headache on my right forehead. I took ibuprofen then my left hand started shaking and my heart was beating so fast. I ended up calling 911 thinking something was more serious with me but by the time the paramedics came my pulse and heart beat were normal. Almost 48 hours later i still had the headache and now was having shortness of breath, feeling tired, back ache, panic attack and light headedness. I called my DR and she said i probably just needed some rest. No mention of some possible side effect to doxy so i used my initiative and googled this stupid doxy drug..Wow the results were very helpful and now i know its the doxy doing this to me for sure. I stopped taking it right away which is after only 3 days after but my body hasn't gone back to normal. No more shortness of breath but still have back ache, Oh and for some reason i cant sleep..its 5 am right now and am on my computer..so i think i'll add insomnia to the list of side effects..NEVER AGAIN WILL I TAKE DOXY