Doxycycline Hyclate and muscle spasms

Took Doxy in Feb 02 for inflammatory infection (50mg 3 times daily for 2 weeks). Suffered muscle spasms, palpitations, dizzyness, severe weight loss and tightness in throat after 2 week dose. However, similar but not so frequent symptoms over 2 years later still persist including general aches and pains, tinnitus, itching and many more strange and not-so-wonderful feelings. Have been told these symptoms are due to anxiety / stress but I'm not convinced. A colleague has recently experienced similar symptoms after being prescribed doxy for an infection. He still suffers the same symtoms some 4-months after stopping doxy. One to avoid if possible I feel.