Doxycycline Hyclate and adverse reaction

I took Doxycycline in 98 for 3 months when traveling in SE Asia, I became extremely paranoid and my hair started falling out (I've never had this prior or since) so I stopped taking Doxycycline and within a few day's I was back to normal. Last year I went on another trip to SE Asia and was advised to have Doxycycline again with lots of assurances that it would be fine despite my previous reaction. After 1 week of having Doxycycline I awoke in the middle of the night with extreme pain running up and down one side of my body. Since then I have never been the same, constant reoccurring problems of the Central Nervous System including nausea, twitching, numbness, tingling, blurred vision. Also initially I had hair falling out. I've been tested for MS, fibromyalgia, lupus, lymes, etc. with negative results so far. The doctors dismiss the possibilities of a adverse reaction to Doxycycline but I'm not so sure. My reaction in 98 was very obvious to me if no doctors seem to think so. I had also had a vaccination for Japanese Encephalitis.