Doxycycline Hyclate and patent

I took 1 pill (100mg) Doxycycline HCl, went to bed, slept very groggy, exhausted. Next day, second pill, 1 hr later feeling nauseated, then severe migraine headache, thew up, felt like in a severe fever. This lasted about 5 hours then reduced to exhaustion, dizziness with some heartburn. It was intolerable. I also felt very depressed and negative.

One website describing a patent for a different formulation of Doxycycline reported that 31% of patients taking this experience nausea and vomiting.

Why is this drug so frequently prescribed?

Stop taking this drug if you have side effects.
After doing a little research it seems that the "Hyclate" formulation has many side effect problems. The other formulations (monohydrate or carrageenan) may be better. The Hyclate formulation is very rapidly absorbed and is acidic and can cause local damage to the stomach or esophagus. Some report these symptoms on this website. Also it seems foolish for this to be in capsule form, since this increases the rapidity of dissolving and probably also local damage. The drug is 'good' in that it stays in your system a long time and brings your body to a high amount of antibiotic rapidly.

I have never had a bad reaction to an antibiotic before. I'm glad this website allows for these reports.