I Have Been Taking Doxycyclin For Three Weeks ( As

I have been taking doxycyclin for three weeks ( as an anti malarial) . One evening , just over a week ago I experienced nausea and vomiting, and the next morning diahorrea. In the following days I experience feeling a lump in my throat, and some visible swelling of a tonsil, I have had difficult and pain when swallowing for a week, which has only started to feel better today. Now feeling extremely nauseous again after taking one tablet of doxycycline and feel a burning sensation from my throat to my stomach. I realise now that I have not taken the doxy with sufficient food and water. Please could you advise.