I started taking Doxycycline Hyclate for an infection....i had been taking it for about 4 days.....one night i take the medicine and i go to sleep.....i wake up the following day with the painful and disturbing sensation that something was stuck in my throat.....and drinking a lot of water to make it go away was in vain......in a couple of days i had trouble eating and drinking and also breathing - i felt burns in the upper back...constant pain.....so I just stopped taking them.....After a couple of days i go back to my doctor and try to explain all the symptoms and try to tell him that i think that it has to do with the medicine that he prescribed....he cuts me off "No, that,s not possible, the medicine I prescribed was for something else!" .....ok ....so I'm thinking "he's the doctor, he knows better, after all he went to school for that!!!!" ....so instead of actually listening to all my symptoms he takes blood test to see what is the cause of my pain; an infection? the liver? etc. etc..........and then at night I come home, I google the side effect of Doxycycline Hyclate and see that I am not crazy...that this happened to a lot of people and that I NEED TO CHANGE MY DOCTOR!!!! Oh, by the way, the doctor prescribed me Propoxyphene-N 100W/APAP (some pain relievers) and told me to take them 10 days without stopping even if the pain goes away!!!!!??????!!!!!!?????!!!!........................L.